Four of the candidates vying to replace Democratic U.S. Senate nominee Graham Platner in the race against Republican Sen. Susan Collins will participate in a televised debate Thursday night.

Secretary of State Shenna Bellows, former Maine Senate president Troy Jackson, former Maine CDC director Nirav Shah and former political aide Jordan Wood are scheduled to participate in the debate on News Center Maine, the Portland Press Herald reported.

The debate starts at 7 p.m. and is scheduled to run 90 minutes.

It will be the first debate in the new field of candidates that sprung up after Platner dropped out of the race in the face of a rape allegation that he denies.

Thursday’s debate comes at a flashpoint for the U.S. Senate race after federal immigration agents shot and killed a 26-year-old in his car in downtown Biddeford. All of the Democratic candidates have since called for the abolition of ICE, while Collins, who cast a deciding vote to fund the controversial federal law enforcement agency, accused them of politicizing a tragedy.

All four candidates lost in June primaries this year. Bellows, Jackson and Shah ran unsuccessfully for the gubernatorial nomination. Wood started in the U.S. Senate primary then shifted to compete for the nomination in Maine’s 2nd Congressional District.

Other Democrats competing for the U.S. Senate nomination are former government official David Costello, midcoast state Rep. Valli Geiger, Maine Beer Co. co-founder Dan Kleban and social worker Paige Loud.

The nominee to face Collins will be chosen by roughly 600 delegates at a special Maine Democratic Party convention later this month.