Real estate magnate Donald Trump moved to the top of the 2016 Republican presidential field in a CNN poll released on Sunday, edging out rival Jeb Bush and gaining support from Republicans in the last month despite a series of controversial statements.

Trump was backed by 18 percent of Republicans in the CNN poll, which was conducted entirely after his July 18 criticism of Republican Sen. John McCain's war record. His lead over Bush, a former Florida governor who was at 15 percent, was within the poll's margin of error.

"There is a movement going on. This is more than me," Trump said on CNN's "State of the Union," saying the poll results were not surprising. "People are tired of these incompetent politicians in Washington that can't get anything done."