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Mitt Romney lambasted Trump for his efforts to cast doubt on the results of the Presidential election, according to NBC News.

Romney says Trump’s team has not shown any evidence of voter fraud.

Romney said, “It is difficult to imagine a worse, more undemocratic action by a sitting American President.”

More from NBC News:

His comments came after Trump’s attorney, Rudy Giuliani, baselessly claimed during a chaotic press conference Thursday that voter fraud was nationally coordinated, despite there being no evidence.

Romney congratulated President-elect Joe Biden and Vice President-elect Kamala Harris on the Saturday following the election when the presidential race was called for Biden. Romney also told reporters Nov. 10 that Biden should be given the green light to begin a transition, which the head of the General Services Administration has refused to grant so far.

Romney, the 2012 GOP presidential nominee who lost to President Barck Obama, has been a frequent critic of Trump and the senator has been ramping up those comments in the wake of the election. He voted earlier this year with Democrats to convict Trump in his Senate impeachment trial.