Newt Gingrich is expected to suspend his campaign for president on Tuesday, May 1, Fox News reported Wednesday.
A senior campaign aide told the network the former House Speaker will "more than likely" endorse Mitt Romney at that time.
According to CNN, Gingrich will announce the end of his presidential bid during an event in Washington, D.C., "surrounded by his family and supporters."
The reports come after Romney swept all five presidential primaries Tuesday, leading to increased speculation Gingrich would drop out.
Gingrich previously vowed to remain in the race for the Republican nomination until the GOP convention in August.
Ron Paul said earlier this week he too would remain in the race until the convention, even if Romney secures the 1,144 delegates required to clinch the nomination.