"Not only are the Do Nothing Democrats interfering in the 2020 Election, but they are continuing to interfere in the 2016 Election. They must be stopped!" he said in another tweet.
In a third tweet, Trump said that Romney's time was up.
"Mitt, get off the stage, you've had your turn (twice)!" Trump tweeted along with a news video of Romney.
On Friday, Romney had slammed Trump for asking China and Ukraine to investigate former Vice President Joe Biden.
"By all appearances, the President's brazen and unprecedented appeal to China and to Ukraine to investigate Joe Biden is wrong and appalling," Romney had tweeted.
"When the only American citizen President Trump singles out for China's investigation is his political opponent in the midst of the Democratic nomination process, it strains credulity to suggest that it is anything other than politically motivated," he had said in another tweet.
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