Democrats see an upside to Trump stonewalling their impeachment inquiry . https://www.vox.com/policy-and-politics/2019/10/8/20904930/democrats-trump-impeachment-letter-ukraine-pelosi
They argue it looks like obstruction
The Trump administration’s decision to block a key witness from testifying in the Ukraine-related impeachment inquiry isn’t a concern for House Democrats. In fact, they say that move gives them even greater ammunition for President Donald Trump’s impeachment.
Here’s why: keeping US Ambassador to the European Union Gordon Sondland away from congressional investigators on Tuesday may only increase perceptions that Trump aims to obstruct justice. While Democrats will subpoena Sondland and others the White House could try to stop from giving testimony, they say the fact that they have to compel appearances is damning enough.
“The failure to produce this witness, the failure to produce these documents, we consider yet additional strong evidence of obstruction of the constitutional functions of Congress,” House Intelligence Committee Chair Adam Schiff (D-CA) told reporters on Tuesday.
Sondland isn’t the only administration official Trump’s allies want to block from testifying in the inquiry on Trump’s effort to get Ukraine to investigate former Vice President Joe Biden, seemingly in exchange for military aid. Also on Tuesday, the White House sent a scorching eight-page letter to leading House Democrats saying they would no longer cooperate with the investigation because it’s a political hit job.