Definition: Given a document, generate a short title of the document. The title should convey the main idea/event/topic about which the document is being written. Note that URLs in the text have been replaced with [Link].
Input: "An American first: a president who was obviously mentally ill the moment  he  took office  " Krugman  tweeted along with a New York Times report that Trump brought up debunked claims that millions of people voted illegally in the election  causing  him  to lose the popular vote  during a Monday night meeting with Congressional leaders.
 Krugman  has criticized Trump repeatedly since  his  election â questioning Trump's business conflicts of interest   his  Cabinet nominees  the involvement of Russia in  his  election  and more. But this is the first time  Krugman  called into question the mental fitness of the president.
 Krugman  has also been critical of Comey  arguing that Comey's letter to Congress regarding the renewed investigation into Hillary Clinton's use of a private email server swung the election in Trump's favor.
 Krugman  highlighted part of a Washington Post article about Trump's attitude after the election. "Read it and shudder " he wrote.
In subsequent tweets   Krugman  said that despite Trump's best efforts  the growing difference between increasing US interest rates due to rate hikes from the Federal Reserve and the interest rates throughout the rest of the world would increase the strength of the US dollar. A strong dollar would be harmful to US manufacturing  offsetting any pro-manufacturing policies from Trump   Krugman  said.

Paul Krugman calls Trump 'obviously mentally ill' in tweet