The president's supporters appear to have been galvanized by the inquiry.
President Trump has struggled to find popularity with black and Hispanic voters, and has previously used language that his critics have branded racist.
The president has made the claim a handful of times, but it is not yet clear which poll he is referring to.
Twitter users questioned why the president would bother sharing a poll from the alt-right website, while others pointed out some very different poll results released this week.
The lawyer shared a poll showing that only 3 percent of black voters back Trump.
Slightly more than half of Republicans in a recent poll supported Trump's views on the "fake news" media.
But the results don't seem to have had an impact on his approval ratings.
The president has faced a challenging time.
The South was once a stronghold for Trump.
The disparity in Trump's approval rating between men and women was dubbed "the Stormy effect."
The president is trailing an unnamed Democrat candidate.
Most Americans do not approve of the president's performance.
The president has said he's "the least racist person," but a Quinnipiac University poll suggests many voters have doubts.
The largest portion of voters said the president was failing in his first year in office.
Despite the nation being divided on a number of issues, some people are giving the country a thumbs up.
Trump is losing support among a group of voters who backed both himself and Obama.
The president found support in Michigan, Pennsylvania and Wisconsin, but voters there are concerned after Charlottesville.
The president's decision to fire FBI chief James Comey did not poll well with voters, who disliked the manner in which he was terminated.