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President Donald Trump warned over the weekend that markets would crash if not re-elected, but a new poll highlights impeachment threat.

A day after President Donald Trump warned over Twitter that if he's not re-elected the markets will "crash," a new poll shows that more Americans than before believe there's strong enough evidence to begin impeachment hearings now.

More than a quarter -- 27% -- of Americans believe enough evidence exists to start hearings immediately for impeachment. That's up from 17% a month ago, found the NBC News and Wall Street Journal poll that also found booting the president is increasingly favored by Democrats.

Yet, about half -- 48% -- of those polled believe Congress should hold off on impeachment hearings, allowing the president to complete his term.

The poll comes weeks after former special counsel Robert Mueller said publicly that if his team that investigated Russian interference in the 2016 election was confident the president didn't commit an obstruction of justice crime, "we would have said so."

Trump's approval rating isn't too far off, however, from previous finds of earlier NBC News/Wall Street Journal polls, with about 53% saying they disapprove of the president's performance and 44% saying they approve. The poll asked 1,000 adults from June 8-11 their feelings on the president and other matters, and has a margin of error of plus or minus 3.1 percentage points.

Earlier in the weekend -- as Trump gears up for his 2020 campaign -- he wrote over Twitter that "if anyone but me takes over in 2020 (I know the competition very well), there will be a Market Crash the likes of which has not been seen before!"