they want to hold his administration accountable, now armed with the power to sub bina, democrats are poised to launch an onslaught of investigations. the president says if that happens, he'll go after them, with help from the republican-led senate. >> they can play that game, but we can play it better. because we have a thing called the united states senate. and all you're going to do is end up in back and forth and back and forth and two years is going to go up and we won't have done a thing. >> reporter: the president says he's willing to work with democrats on issues like health care and infrastructure, but any bipartis bipartisanship would grind to a halt if they investigate him. >> can you compartmentalize that and still continue to work with them for the benefit of the rest of the country? or are all belts off? >> no. no. if they do that, all of it is a war-like posture. pelosi today unfazed. >> they do note intent to abandon our relinquish our responsibilities for accountability, for oversight and the rest. >> mary bruce with us live from the hill tonight. and mary, nancy pelo