President Donald Trump's re-election campaign has parted ways with some of its pollsters after the leak of internal polling showing Trump trailing Democratic front-runner Joe Biden in some key battleground states.

Trump and his aides first disputed the poll's existence, then tried to discount its importance.

The high-profile internal drama on the brink of Trump's formal reelection launch could signal trouble ahead for the campaign if staffers are skittish about being candid with Trump.

Supporters of President Donald Trump line up on Monday, June 17, 2019, in Orlando, Fla., more that 24 hours before a rally for the presdient. (AP PhotoJohn Raoux)

Supporters of President Donald Trump line up on Monday, June 17, 2019, in Orlando, Fla., more that 24 hours before a rally for the presdient. (AP PhotoJohn Raoux)

The episode is also a sobering reminder that for all of the Trump campaign's efforts to professionalize its operation, much hasn't changed.