Arnie Seipel

Updated at 9:40 a.m. ET

Republican presidential nominee Donald Trump's campaign will begin airing its first television ads of the general election in the coming days, the campaign confirms to NPR.

Sen. Bernie Sanders went out of his way Sunday to find praise for the Democratic party's platform drafting committee, but there is one major sticking point: The Trans-Pacific Partnership.

Sanders wants the final platform to unequivocally oppose the free-trade deal that was negotiated by the Obama administration, saying it "threatens our democracy" in an op-ed published in The Philadelphia Inquirer on Sunday.

A man who was arrested at a Donald Trump rally in Las Vegas on Saturday after reportedly trying to grab a police officer's gun intended to "shoot and kill" the Republican presidential nominee, according to court documents released on Monday.

Hillary Clinton won today's Democratic primary in Puerto Rico, according to the Associated Press.

With about a quarter of precincts reporting, Clinton had about two-thirds of the vote. Vermont Sen. Bernie Sanders had about one-third.

Following the death of legendary boxer Muhammad Ali on Friday night, the White House released the following statement from President Obama, recalling the boxer's legacy in sports and society:

Muhammad Ali was The Greatest. Period. If you just asked him, he'd tell you. He'd tell you he was the double greatest; that he'd "handcuffed lightning, thrown thunder into jail."

But what made The Champ the greatest – what truly separated him from everyone else – is that everyone else would tell you pretty much the same thing.

The campaign of Sen. Bernie Sanders announced on Sunday that his campaign raised $26 million in April, fueled largely by small donations, a drop-off from the $46 million he raised in March and $42 million in February, according to the Federal Election Commission.

The slowing pace comes as the primary season heads into its final month, with Sanders practically out of reach of the Democratic nomination.

The Ted Cruz and John Kasich campaigns announced apparent coordinated strategies to combat Donald Trump in select upcoming primaries — an effort to force an open convention when the Republican National Committee gathers in Cleveland in July.

In a statement sent out Sunday evening, the Cruz campaign said it will focus resources on Indiana, "and in turn clear the path for Gov. Kasich to compete in Oregon and New Mexico."

George Clooney says he hates raising money for politics.

But after hosting two big-ticket fundraisers with his wife, Amal, that reportedly raised $15 million in support of Hillary Clinton this weekend, Clooney is defending that haul by drawing attention to a big difference in how the former secretary of state and her rival, Vermont Sen. Bernie Sanders, are bringing in cash.

After terrorist attacks in Brussels on Tuesday morning that killed more than 30 people and wounded more than 200, American politicians took to social media and TV news programs to respond to the violence.

Several pointed to the attacks as a reason to focus America's fight against Islamic extremism.

We're compiling responses from elected officials and presidential candidates here:

Former Secretary of State Colin Powell has a message for the Republican Party: "We have to become more respectful of each other."

Speaking on the death of former first lady Nancy Reagan, Powell said he believed she would be "disturbed" by the way her husband's legacy is invoked by some people today. Powell spoke in an interview with NPR's Michel Martin on All Things Considered.

Just seven candidates will take the main stage for the next Republican presidential debate, on the Fox Business Network on Thursday evening — the fewest of any GOP debate so far in the 2016 campaign.

Businessman Donald Trump, Texas Sen. Ted Cruz, Florida Sen. Marco Rubio, Dr. Ben Carson, New Jersey Gov. Chris Christie, former Florida Gov. Jeb Bush and Ohio Gov. John Kasich will battle it out in the main event in Charleston, S.C.

South Carolina Sen. Lindsey Graham is ending his bid for the Republican presidential nomination.

Graham tweeted the news, with a video of his announcement.

In an interview with CNN, Graham said, "I'm going to suspend my campaign. I'm not going to suspend my desire to help the country."

One of the statement's that got the most attention, and criticism, during Saturday's Democratic presidential debate was Hillary Clinton's assertion that "we now finally are where we need to be" in Syria.

Jeb Bush pounced, along with many others on the right, to call Clinton out on the assertion, given that ISIS still holds a lot of territory in Syria, and given the recent attacks in Paris and San Bernardino.

But what's interesting furthermore are the two assertions Clinton made to back up her statement.

Perhaps the clearest sign that Ted Cruz is seriously challenging Donald Trump's dominance in the Republican primary race is that Trump has started attacking him.

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