卢比奥预定宣布参加2016年总统选举

The race to become the next U.S. president is quickly getting crowded, with Senator Marco Rubio set to announce his bid Monday, a day after former Secretary of State Hillary Clinton launched her campaign.

The 43-year-old Rubio, who is the son of Cuban immigrants, is expected to formally join the race at an event Monday evening in Miami at the site where authorities first registered Cubans fleeing the government of Fidel Castro in the 1960s.

A video promoting the announcement casts Rubio's campaign as a "new direction for America." It features clips of speeches where he promotes the need for the U.S. to be a strong world leader and criticizes the policies of President Barack Obama.

Rubio will be the third Republican to compete for the party's nomination for the 2016 election, joining fellow Senators Rand Paul and Ted Cruz. Wisconsin Governor Scott Walker and former Florida Governor Jeb Bush are also expected to run.

Clinton announced her candidacy to be the Democratic nominee in an online video Sunday in which she promised to work for the middle class.