With their respective national conventions less than a month away, expected Democratic and Republican presidential nominees Hillary Clinton and Donald Trump began to sharpen their focus on each other and the November general election this week.
With their respective national conventions less than a month away, expected Democratic and Republican presidential nominees Hillary Clinton and Donald Trump began to sharpen their focus on each other and the November general election this week.
While the former first lady and billionaire businessman took jabs at each others' records and positions through new online ads and attack websites, Bernie Sanders returned to Congress to stand in solidarity with other Democrats pushing for so-called "gun control" changes.
The Vermont senator, who acknowledged that he will likely not be the Democratic nominee, further set his sights on impacting the party's long-term platform, taking his campaign on the road to encourage supporters to continue pushing for a "political revolution" beyond the 2016 election.
Here's what happened in presidential politics this week:
Trump's campaign manager Corey Lewandowski left the campaign.
Trump spokeswoman Hope Hicks announced the campaign manager's exit Monday, saying he "will no longer be working with the campaign," the Associated Press reported.
Lewandowski had been by Trump's side since the beginning of his GOP White House bid. News of his exit followed a tumultuous stretch marked by missteps.
Lewandowski, who gained attention after being accused of grabbing a reporter during a campaign event in March -- charges which were later dropped, joined CNN as a political commentator, the network told the New York Times Thursday.
Clinton and Sanders condemned congressional Republicans for rejecting so-called "gun control" measures.
The Democratic presidential rivals joined together late-Monday in criticizing U.S. Senate Republicans for voting down firearms-related measures in the wake of a recent deadly mass shooting at an Orlando nightclub.
Clinton chastised Senate Republicans for blocking changes that her campaign argued are "intended to keep guns out of the hands of terrorists -- including proposals to expand background checks and prohibit suspected terrorists from buying guns."
"Enough," she said in a statement, which listed the names of those killed in the nightclub attack.
Sanders, a U.S. senator from Vermont who voted for the Democratic-backed measures, said "it's not very hard to understand that potential terrorists, criminals and the dangerously mentally ill should not have access to guns." He further contended that the Democrat-sponsored proposals "are commonsense."
The senator joined U.S House Democrats later in the week for a sit-in demonstration protesting the chamber's refusal to consider similar firearms-related measures ahead of a planned recess.
Police arrested a 19-year-old who attempted to kill Trump at a campaign rally.
Michael Sandford, a British man, reportedly tried to pull the weapon from a Las Vegas officer's holster while speaking to him, police told CNN Tuesday.
Sandford first struck up a conversation with the officer, telling him he would like to get an autograph from Trump, the Associated Press reported.
A complaint filed in U.S. District Court Monday charged Sandford with an act of violence on restricted grounds. Sandford claimed he had been planning to kill Trump for about a year, according to the complaint.
Trump brushed back campaign finance questions after reports showed anemic fundraising in May.
The billionaire businessman, who largely self-funded his presidential primary campaign, hit back against reports that he ended May with less than $1.3 million in the bank -- far behind the $42 million in cash Clinton had at the end of the same period.
Trump's campaign attributed the disparity between the two presumptive presidential nominees to the GOP White House hopeful only kicking-off his fundraising efforts on May 25 -- shortly before the reporting deadline.
Trump added that "if need be, there could be unlimited 'cash on hand'" if he put up his own money like he did in the primaries.
"Our campaign is leaner and more efficient, like our government should be," he said in a statement.
U.S. Sen. Elizabeth Warren, D-Mass., continued her attack on Trump in new video ad.
The Massachusetts Democrat, who is rumored to be on Clinton's vice presidential short list, called Trump "a fraud, a cheapskate and...a bully," as well as urged voters to speak out against his "scams" and "disgusting" language in a new MoveOn.org video released this week.
Warren blasted the businessman for failing to release his federal tax returns, suggesting that he may not want the American people to find out he's worth less than he claims and is a "lousy businessman."
The senator, whom Trump has deemed "Goofy Warren," acknowledged that she's likely to face additional pushback from the businessman for her comments, contending that he does it to "intimidate, to threaten, to make us shut up."
Warren said she will not back down and urged Americans to come together against the presumptive GOP presidential nominee.
A Worcester-based Super PAC launched to help Trump's campaign in Massachusetts.
The Make Massachusetts Great Again PAC, which officially launched Tuesday evening, has pledged to use all of the money it raises to educate state voters on why they should support the billionaire businessman in the November general election.
The Super PAC is not officially authorized by Trump's campaign, but is "focused on winning the commonwealth for" the expected GOP nominee.
Bonnie Johnson, the Make Massachusetts Great Again executive director and a Republican National Convention delegate for Trump, said the organization wants to build on the support the businessman saw in the state during the primaries and reach out to unenrolled or Democratic voters who may be on the fence.
"We started it because we want to make sure Massachusetts is in play (in the general election,)" she said in an interview. "We don't want to give the Democrats a free pass in Massachusetts."
Trump and Clinton exchanged barbs on new campaign attack websites.
Taking the general election fight online, Clinton released a new website and video early Tuesday, which her campaign contended highlights "Trump's real business record -- and what it could mean for the economy."
The campaign's new website, "ArtOfTheSteal.biz," took aim at Trump's promises to help America "win," suggesting that many of his business ventures have been "losers."
Hours later, Trump announced the roll out of his own website, "LyingCrookedHillary.com," to "showcase some of Clinton's most disastrous lies to the American people."
The businessman launched the first in a series of attacks against the former secretary of state on his website Thursday, posting a minute-long ad contending that she was aware that the Benghazi incident was a terrorist attack within hours, but "lied anyways," suggesting it was due to a YouTube video.
Sanders acknowledged that he will likely not represent the Democratic party in the November general election.
Sanders addressed the future of his White House bid during a Wednesday interview on C-SPAN, saying he's unlikely to beat Clinton.
Despite his admission, the Vermont senator said he has not reached an agreement to endorse the former first lady and has been negotiating with her campaign.
"It doesn't appear that I'm going to be the nominee, so I'm not going to be determining the scope of the convention," he said when asked if he plans to speak at the Democratic gathering in Philadelphia next month.
The senator also took aim at Trump, contending that the businessman "in a dozen different ways is literally unfit to be president of the United States."
Sanders said he will vote for Clinton if she is the Democratic Party's nominee.
Despite pledging to take his campaign to the Democratic National Convention in Philadelphia next month, the Vermont senator said Friday that he will vote for Clinton if she is named the party's nominee.
Sanders, in an interview on "MSNBC's Morning Joe," said "yes," when asked if he will vote for his Democratic rival in the November general election.
Although the Vermont senator, who has yet to exit the Democratic race, fell short of fully endorsing Clinton, he remained firm in his commitment to keep expected Trump out of the White House.
Sanders took his progressive platform fight on the road, urged upstate New York supporters to remain active in political process.
The Vermont senator rallied supporters Friday to move forward with his so-called "political revolution" and to continue pushing for the progressive policies championed by his campaign.
Sanders, who engaged with more than 400 people who crowded Albany's Lewis A. Swyer Theatre during the afternoon event, urged supporters to move forward and build on what the campaign had accomplished over the last year.
"Struggle and victory is not easy. We've got to keep going," he said. "And what this campaign has accomplished is just opening up the doors to a process that must, must, must continue, and that's why I'm here today."