Donald Trump. Branden Camp/Getty Images Donald Trump's poll numbers are plummeting — and even the presumptive Republican nominee has acknowledged it.

In the latest RealClearPolitics average of several polls, Trump trails Hillary Clinton, the presumptive Democratic nominee, by 5.8 points. It's a 6-point reversal from a month ago.

The fall in fortune comes after he trailed Clinton by 12 points in a Bloomberg poll released earlier this week. Polls from Reuters and CBS News showed Trump behind by 9 points and 6 points.

Trump has fallen behind Clinton in 12 consecutive polls posted to RealClearPolitics.

Less than a month ago, Trump's future was looking brighter against Clinton in their general-election matchup.

As recently as May 25, Trump led Clinton in the RCP polling average by one-fifth of a point — the first instance of the Manhattan businessman leaping ahead of Clinton in the coveted polling average.

But as Trump has taken hits for his attacks on a federal judge over his Mexican heritage and a controversial response to last weekend's terrorist attack in Orlando, Florida, his poll numbers have taken a nosedive. At 38.3%, Trump's average support in a one-on-one matchup against Clinton is the lowest it has been since August 15 — just two months after he launched his campaign.

The chart below shows just how dramatic the plummet of Trump's poll numbers has been:

Trump has dropped his poll numbers as a talking point during recent rallies. He conceded in a phone interview with New York Times reporter Maggie Haberman that his poll standing wasn't so hot.