After Question's About Trump's Mental Health Mount He Responds With Bizarre Claim

President Trump, whose sometimes erratic behavior in office has generated an unprecedented debate about his mental health, declared on Saturday that he was perfectly sane and accused his critics of raising questions to score political points.

In a series of Twitter messages that were extraordinary even by the standards of his norm-shattering presidency, Mr. Trump insisted that his opponents and the news media were attacking his capacity because they had failed to prove that his campaign conspired with Russia during the 2016 presidential campaign.

“Now that Russian collusion, after one year of intense study, has proven to be a total hoax on the American public, the Democrats and their lapdogs, the Fake News Mainstream Media, are taking out the old Ronald Reagan playbook and screaming mental stability and intelligence,” he wrote on Twitter even as a special counsel continues to investigate the Russia matter.

“Actually, throughout my life, my two greatest assets have been mental stability and being, like, really smart,” he added. He said he was a “VERY successful businessman” and television star who won the presidency on his first try. “I think that would qualify as not smart, but genius....and a very stable genius at that!”

Mr. Trump’s self-absorption, impulsiveness, lack of empathy, obsessive focus on slights, tenuous grasp of facts and penchant for sometimes far-fetched conspiracy theories have generated endless op-ed columns, magazine articles, books, professional panel discussions and cable television speculation.

“The level of concern by the public is now enormous,” said Bandy X. Lee, a forensic psychiatrist at Yale School of Medicine and editor of “The Dangerous Case of Donald Trump: 27 Psychiatrists and Mental Health Experts Assess a President,” a book released last fall. “They’re telling us to speak more loudly and clearly and not to stop until something is done because they are terrified.”

As Politico reported, Dr. Lee was invited to Capitol Hill last month to meet with about a dozen members of Congress to discuss the matter. But all but one of the lawmakers she briefed are Democrats. While some Republicans have raised concerns, they do so mostly in private. Others scoff at the question, dismissing it as outrageous character assassination.