“House Democrats are expected to interview other critical witnesses this week as they try to build a case for impeaching Trump over his alleged willingness to seek the help of a foreign leader for his own political gain,” the Washington Post reports.

“But these rare triumphs are seen as fleeting even by Democrats and serve as a stark reminder of how much the administration has run roughshod over Congress, prompting concerns among constitutional experts and lawmakers that Trump’s hostile stance toward congressional oversight is undermining the separation of powers in a way that could have long-term implications for democracy.”

“House Democrats on Monday issued subpoenas to the Pentagon and the White House budget office as part of their impeachment inquiry, requesting documents related to U.S. President Donald Trump’s decision to withhold military assistance for Ukraine,” the New York Times reports.

Matthew Yglesias: “We, of course, don’t know what’s going to happen.”

“But what we can tell you is that there are roughly nine scenarios of varying degrees of plausibility that are legally and constitutionally possible. Some of these involve Trump being impeached and some involve him leaving office and possibly, but not necessarily, both of those things. Some involve Nancy Pelosi, Mike Pompeo, or Steve Mnuchin becoming president. In theory, Trump could even be booted from office and then run again for reelection in 2020.”