Donald Trump Jr. declared Tuesday that there are high-level forces in the U.S. government working against his father, President Trump.

Speaking at a conservative conference in West Palm Beach, Fla., Trump's oldest child said there is a movement to not let "America be America."

"There is, and there are, people at the highest levels of government that don't want to let America be America," he said at the Turning Point USA Student Action Summit.

Trump Jr. also said that special counsel Robert Mueller's federal Russia inquiry is indicative of the sort of "rigged system" that his father complained about during the 2016 campaign, according to CNN.

Trump Jr.'s comments come as his father's campaign and transition team are being investigated by Mueller and congressional panels to find possible collusion with the Russians.

It was recently revealed that Mueller removed Peter Strzok, a top FBI counterintelligence agent, from his investigation because of anti-Trump texts he exchanged with Lisa Page, an FBI lawyer who had also been assigned to the Mueller probe and has since been removed.

There have been rumblings in Washington that the president might try and fire Mueller soon, but the Trump team maintains that is not true.