Senate Minority Leader Harry Reid accused House and Senate GOP leaders of “moral cowardice” Thursday for not disavowing GOP front-runner Donald Trump.

“No one is working harder to support Donald Trump than Mitch McConnell,” Reid said of the Kentucky Republican who is Senate majority leader.

Reid, D-Nev., said the Senate leader’s decision not to consider President Barack Obama’s nominee to the Supreme Court reflects the sort of obstruction that Trump embraces. “Donald Trump followed the Mitch McConnell playbook,” in calling for “delay, delay delay,” he said.

The fact that even in speaking against Trump, McConnell and House Speaker Paul D. Ryan, R-Wis., will not oppose the billionaire businessman’s candidacy is, “precisely the kind of moral cowardice that enabled the rise of Trump,” Reid said in a speech before the Center for American Progress Action Fund.

“For too long, Senator McConnell and Speaker Ryan have tried to have it both ways, giving Trump a slap on the wrist each time he says something detestable, but always committing to support him at the end of the day,” Reid said.