MSNBC's Mika Brzezinski on Monday expressed concern about President Trump after his claims that former President Barack Obama Barack Hussein ObamaGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high D-Day for Trump: September 29 Obama says making a voting plan is part of 'how to quarantine successfully' MORE wiretapped Trump Tower before the election.

"This is not funny," Brzezinski said on MSNBC's "Morning Joe."

"This is really bad. Just for the record, we are all really nervous. So if people out there feel nervous, we do too. We don’t think this is funny."

Brzezinski also said the country is at a "low point in American history."