white house of stonewalling. >> let me be clear. if don mcgahn doesn't testify it's time to open up an impeachment inquiry. >> reporter: michigan congressman justin amash a frequent critic of the president tweeting after reading the mueller report, president trump has engaged in impeachable conduct. the president calling amash a loser and a lightweight. >> i've known him and he's been against trump from the beginning. he probably wants to run for some other office. i don't think he'll do very well. he's been a loser for a long time. >> reporter: back in his michigan district more backlash against amash. >> i don't support him on that statement. >> i don't agree with -- i think that the job that the president is doing is phenomenal. >> reporter: late monday night a federal judge upheld a subpoena from house democrats for some of the president's financial records from an accounting firm.