Axios

The three words to watch at President Trump's pair of summits over the next month: verifiable, measurable and enforceable.

Driving the news: Trump is on his way to Vietnam, where he'll meet with North Korean leader Kim Jong-un. He'll then host Chinese President Xi Jinping at Mar-a-Lago sometime in March. On Monday, he teased a "signing summit" with Xi, saying negotiators are "getting very, very close."

Washington Gov. Jay Inslee (D), who said Monday he’s close to making a decision on whether he will launch a 2020 presidential bid, told the HuffPost that the Senate filibuster, which requires 60 votes to pass most bills instead of a majority rule, should be eliminated.

"I do believe that the time for the filibuster has come and gone. It was an artifact of a bygone era that is not in the U.S. Constitution and somehow it got grafted on in this culture of the Senate."

9/11 first responders and victims impacted by the toxins at ground zero lobbied lawmakers on Monday to make the 9/11 Victims Compensation Fund permanent before the fund's authorization expires next year, the New York Daily News reports.

Why it matters: The fund is running out of money — so much so that cases emerging after Feb. 1 will only get paid 30% of what earlier claims did. After 2020, no claims will be paid out if Congress doesn’t take action. 93,028 first responders or survivors were still being treated or monitored in the World Trade Center Health Program at the end of 2018, with about 800 new people signing up every month, according to the Daily News.

58 former senior national security officials from both sides of the aisle, including former Secretary of State Madeleine Albright and former Defense Secretary Chuck Hagel, issued a joint declaration Monday arguing "there is no factual basis" for President Trump's use of emergency powers to build a border wall.

"The President's actions are at odds with the overwhelming evidence in the public record, including the administration's own data and estimates. ... [U]nder no plausible assessment of the evidence is there a national emergency today that entitles the President to tap into funds appropriated for other purposes to build a wall at the southern border."

The big picture: The House is expected to vote on a resolution this week that would block Trump’s emergency declaration. If it passes, the Senate will be forced to take it up, putting Republican senators on the record about whether they support the emergency declaration and potentially setting up the first veto of Trump's presidency.

A staffer who worked on President Trump's campaign has filed a lawsuit claiming he kissed her without consent before a rally in Florida in August 2016, an allegation denied by the White House and the two identified witnesses, the Washington Post reports.

Why it matters: This is the first allegation of sexual misconduct against Trump since becoming president.

Sen. Elizabeth Warren will announce today that, as a presidential candidate, she's not going to participate in situations where "people who can write big checks" will have special access to her, according to a letter she sent to her grassroots campaign list.

Why it matters: It's a step beyond her pledge to reject any lobbyist, PAC or super PAC money. "Candidates for public office in America spend way too much time with wealthy donors," she says in her letter. But it means she'll be under extra scrutiny from other campaigns and the media for any interaction she does have with donors.

A new obstacle has emerged in the path to Neomi Rao replacing Brett Kavanaugh on the powerful D.C. Circuit Court.

The state of play: A source close to the White House confirmation process told me that Republican Sen. Josh Hawley has "deep concerns" about Rao's judicial philosophy and has raised these concerns with a number of key figures including Senate Majority Leader Mitch McConnell and White House Counsel Pat Cipollone.

Michael Cohen, Trump's former lawyer and fixer, is set to testify for three consecutive days on Capitol Hill this week.

The backdrop ... Cohen's interview before the House Oversight Committee on Wednesday, his first and only planned public Congressional hearing, will produce a striking split-screen: He testifies while Trump meets in Hanoi with Kim Jong-un.

In his book, "Let Me Finish," Chris Christie answers a question about Donald Trump that has long perplexed me: Why are his ties so ridiculously long?

What he's saying: Christie, who was the first high-profile Republican elected official to endorse Trump's 2016 campaign, describes what Trump was like backstage before rallies. "Donald choreographed every last detail...he produced me, too, or tried to," Christie writes.