President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Tuesday dismissed a new poll that showed his approval rating slipped by 6 percentage points over two months to 38 percent.

In a pair of tweets, Trump cast doubt on the legitimacy of polls that showed him underwater or losing to potential Democratic challengers.

"Many of these polls are fixed, or worked in such a way that a certain candidate will look good or bad. Internal polling looks great, the best ever!" Trump tweeted.

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The president ripped the ABC News-Washington Post poll as "the worst and most inaccurate poll of any taken prior to the 2016 Election" after a survey released earlier Tuesday morning showed his approval rating had dropped by 6 percentage points since June.

"It was a Fake Poll by two very bad and dangerous media outlets," he tweeted.

The ABC-Washington Post poll released just before the 2016 election showed Clinton with a 4-point lead. She ultimately won the popular vote by 2 percentage points, but lost the Electoral College vote.

An ABC News-Washington Post poll released Tuesday morning showed Trump's approval rating dropped from 44 percent in June to 38 percent. Among registered voters, 40 percent approve of Trump while 55 percent disapprove, the poll found.

The poll also found Trump's approval rating on his handling of the economy dropped from 51 percent in early July to 46 percent this month amid growing fears of a recession.

The president regularly dismisses polls that show him losing as rigged or fake. He has lashed out at Fox News over the network's polling that shows Trump losing in hypothetical 2020 match-ups to a number of Democratic candidates.