If Donald Trump thought his Twitter attack against Rep. Elijah Cummings will help him politically, he is wrong, according to a California Democrat. More than that, Trump’s attack against Cummings and his Baltimore district is a mistake because the Maryland Democrat counts some of Trump’s GOP friends among his own supporters, added two-term Rep. Ro Khanna.

Trump started his tweetstorm against Cummings this last weekend, calling the lawmaker’s Baltimore-centered district “infested.” It was just one in a string of racist attacks against non-white Democratic figures.

The chairman of the House Oversight and Government Reform Committee, Cummings is leading a number of investigations of Trump, his business, campaigns and administration.

The attack against Cummings will hurt Trump politically in his own bid for re-election, said Khanna.

“It’s going to hurt him particularly in suburban counties that he needs to carry. And it’s sad because he is going at gut instinct. He thinks that dividing this country is what is going to be in his interest, but he’s miscalculating,” Khanna said. “But notice Chairman Cummings’ response. He didn’t respond in kind, he didn’t attack the president. He actually said he’s still open to working with the president on lowering the cost of prescription drugs. And my view is that people are going to respond to Chairman Cummings because he’s talking about solving the issues that people care about as opposed to going back and forth on Twitter.”

Moreover, Cummings is close to such House conservatives as Reps. Mark Meadows (R-NC) and Jim Jordan (R-Ohio).

“Mark Meadows has a close friendship with Chairman Cummings. He has always been decent in speaking with Chairman Cummings, and Chairman Cummings, as you pointed out, has come to his defense,” Khanna told MSNBC host Steve Kornacki. “President Trump picked the wrong person in going after Elijah Cummings. Elijah Cummings, the son of a sharecropper, has faced so much, overcome so much discrimination, is seen as a moral voice.

“And even Jim Jordan and Mark Meadows, the president’s closest allies, speak with respect of this chairman,” Khanna added. “So it was just the wrong target. That’s why I think it’s going to backfire.”