GOP: We know who spied on our Obamacare arguments

Pablo Martinez Monsivais / AP

Last week, a woman faked being a Congressman's wife to sneak into the GOP retreat in Philadelphia. She recorded convos and sent them to news outlets, who then outed the Republican's indecision over how to repeal and replace Obamacare.

Found: House GOP Conference Chairwoman Cathy McMorris Rodgers announced at a closed-door meeting that the Congressional Institute had figured out who the party-crasher was, according to The Hill. Officials won't release her name, as there is still an active investigation.

Someone trespassed at an event where the president and the vice president were present. That's certainly concerning. — Rep. Carlos Curbelo, who was at the retreat, to The Hill

What's next

New York Times endorses Elizabeth Warren and Amy Klobuchar for president

Democratic presidential candidates Sens. Elizabeth Warrenand Sen. Amy Klobuchar at the December 2020 debatein Los Angeles. Photo: Justin Sullivan/Getty Images

The New York Times editorial board has endorsed Sens. Elizabeth Warren and Amy Klobuchar for president, in a decision announced on national television Sunday night.

Why it matters: The board writes in its editorial that its decision to endorse two candidates is a major break with convention that's intended to address the "realist" and "radical" models being presented to voters by the 2020 Democratic field.

Go deeperArrow55 mins ago - Media

What's next in the impeachment witness battle

Sens. Susan Collins (R-Maine) and Lisa Murkowski (R-Alaska). Photo: Tom Williams/CQ-Roll Call, Inc via Getty Images

Senators will almost certainly get to vote on whether or not to call impeachment witnesses. The resolution laying out the rules of the trial, which will be presented Tuesday, is expected to mandate that senators can take up-or-down votes on calling for witnesses and documents.

Yes, but: Those votes won't come until the House impeachment managers and President Trump's defense team deliver their opening arguments and field Senators' questions.

Inside Trump's impeachment strategy: The national security card

White House counsel Pat Cipollone and acting Chief of Staff Mick Mulvaney. Photo: Jabin Botsford/The Washington Post via Getty Images

Trump officials say they feel especially bullish about one key argument against calling additional impeachment witnesses: It could compromise America's national security.

The big picture: People close to the president say their most compelling argument to persuade nervous Republican senators to vote against calling new witnesses is the claim that they're protecting national security.