MSNBC host Chris Matthews suggested Thursday that President Trump was playing to his anti-Semitic supporters by mispronouncing Sen. Dianne Feinstein's last name.

Matthews said Thursday on MSNBC's "Morning Joe" that when Trump pronounces Feinstein's last name like "Fein-steen," it's an "ethnic" signal.

"I’ve got tell you, in Dianne Feinstein – it’s not Fein-steen, by the way, it’s Feinstein," said Matthews. "He knows how to pronounce her name. He knows what he’s doing. I know that game, little ethnic game, I know how that plays."

At a campaign-style rally Tuesday in Council Bluffs, Iowa, Trump mocked Feinstein as "another beauty" who likely "leaked" the letter Christine Blasey Ford sent to Congress in July, in which Ford accused now-Supreme Court Justice Brett Kavanaugh of sexually assaulting her more than 30 years ago.

Trump's supporters this week joined Trump as he criticized the California Democrat, and chanted "lock her up!" after he suggested that she leaked Ford's name to the press.