U.S. President Donald Trump participates in a rally in Orlando, Florida, the United States, June 18, 2019. Trump formally kicked off his 2020 re-election campaign at a rally in Orlando on Tuesday night. (Photos: Xinhua)

U.S. President Donald Trump participates in a rally in Orlando, Florida, the United States, June 18, 2019. Trump formally kicked off his 2020 re-election campaign at a rally in Orlando on Tuesday night.

A supporter of U.S. President Donald Trump holds a placard outside Trump Tower on the 5th Avenue in Manhattan, New York, the United States, June 18, 2019. Trump formally kicked off his 2020 re-election campaign at a rally in Orlando on Tuesday night.

Supporters of U.S. President Donald Trump watch a live broadcast of Trump speaking at re-election campaign kickoff rally, inside Trump Tower in New York June 18, 2019. Trump formally kicked off his 2020 re-election campaign at a rally in Orlando on Tuesday night.

Supporters of U.S. President Donald Trump watch a live broadcast of Trump speaking at re-election campaign kickoff rally, inside Trump Tower in New York June 18, 2019. Trump formally kicked off his 2020 re-election campaign at a rally in Orlando on Tuesday night.