NEW YORK - US President-elect Donald Trump hit back at former President Bill Clinton on Tuesday after Clinton said in an interview that Trump “doesn’t know much” except for “how to get angry, white men to vote for him.”

Speaking to The Record Review, a regional weekly, Clinton said Trump called him after the election and was cordial “like it was 15 years ago” when Trump was a friend of Bill and Hillary Clinton .

Trump disputed the claim in a tweet, mocking Hillary Clinton’s loss in key swing states such as Pennsylvania and Florida. “Bill Clinton stated that I called him after the election. Wrong, he called me (with a very nice congratulations). He ‘doesn’t know much,’” Trump wrote.  He added: “especially how to get people, even with an unlimited budget, out to vote in the vital swing states ( and more). They focused on wrong states.”

Though Hillary Clinton garnered 2.8 million more votes than Trump, the real-estate magnate was able to carve an electoral path through key swing states such as Pennsylvania, Iowa, and Florida, and won traditionally Democratic states like Wisconsin and Michigan.

For his part, Bill Clinton himself didn’t struggle in swing states. He won 370 electoral votes in the 1992 presidential election, and 379 electoral votes in his 1996 reelection.  High-profile disputes between current and former presidents are not common.

Bill Clinton also Hillary “fought through everything” in her failed campaign for the White House, but “couldn’t prevail” against the combination of Russian hacking and the FBI’s interference.

Clinton , who was joined by New York Governor Andrew Cuomo and New York Mayor Bill de Blasio at the state Capitol to cast his ballot as a New York elector, briefly spoke to reporters following the meeting of the state’s Electoral College.

“I’ve never cast a vote I was prouder of,” the former president told reporters outside the statehouse.

Clinton said his wife fought and prevailed through the email scandal that had plagued her campaign from the beginning but could not overcome the Russian hacking and a letter FBI Director James Comey sent to Congress less than two weeks before Election Day.

In the letter, Comey told lawmakers that the bureau had uncovered new material connected to Clinton’s email investigation. The director, however, notified Congress in a letter two days before the election that his recommendation that Clinton should not be prosecuted remained the same.