TAMPA, the United State- Mitt Romney on Tuesday secured U.S. Republican Party's presidential nomination at the party's national convention, and will challenge President Barack Obama in the coming presidential election.

Romney has passed the threshold of the required 1,144 delegates halfway through the roll call vote of delegates from 50 states, the District of Columbia and U.S. territories, during its national convention at Tampa, Florida.

After passing the nomination, the convention is set to start its roster of speakers in the evening, including Ann Romney and New Jersey Governor Chris Christie, who will give the convention's keynote speech.

The convention is set to continue Wednesday with a speech from Romney's running mate Paul Ryan, and conclude Thursday with Romney 's speech accepting the nomination.