John Bolton, welcome to the Resistance?

Washington has grown accustomed to the unexpected, the unusual and even the bizarre during the presidency of Donald Trump.

But is it ready for John Bolton, hero of the "Resistance"?

It's a question increasingly on the minds of lawmakers, U.S. diplomats and possibly Trump himself as the House Democrats' impeachment inquiry forges ahead. A key revelation so far: Bolton, while serving as Trump's national security adviser, raised alarms about the politically questionable role informal actors were playing in shaping U.S. foreign policy toward Ukraine.