In an angry tweetstorm Sunday morning, President Trump said that if Russian meddling in the 2016 election was intended to sow discord in the United States, "they have succeeded beyond their wildest dreams. They are laughing their asses off in Moscow."

But the president suggested the source of that discord is the ongoing investigation of Russian meddling in the elections and possible collusion between his campaign and Russia, which Trump flatly denies.

Trump spent the weekend at his Mar-a-Lago resort in Florida but he had no public activities and did not play golf as he often does. Instead he met with first responders and some family members of victims of the Wednesday shooting at a high school in Parkland, not far from Mar-a-Lago.

He also spent the weekend tweeting about the FBI's failure to act on warnings about the threatening behavior of alleged shooter Nikolas Cruz and the new revelations about Russian election meddling contained in indictments released Friday by special counsel Robert Mueller.

He also lashed out at Rep. Adam Schiff, the top Democrat on the House Intelligence Committee — which has been riven with partisan bickering over its Trump-Russia investigation — and former president Barack Obama, who Trump said did nothing to prevent Russian meddling.