Activist Headquarters

If the Democrats start impeachment investigations or hearings, aren’t they entitled to get his financial statements, tax returns, etc, and also get the unredacted Mueller report? I had thought Trump can’t hold back information requested by Democrats if it’s for an impeachment investigation.
The worst thing is to do nothing. People are already disengaged from the political process, to do nothing makes Democrats look weak and ineffective. It reinforces the perception that it doesn’t matter who gets elected, they’re all the same.