Another Democratic challenger to Sen. Kirsten GillibrandKirsten GillibrandSenate approves Trump's Agriculture chief Dems urge Trump to include Northeast Corridor tunnel project in infrastructure bill Dems petition FDA to ban potentially toxic chemical from shampoos, body wash MORE (D-N.Y.) dropped out of the race on Tuesday, further clearing the field for the new senator as she heads into her first reelection bid.

In a statement, Manhattan Borough President Scott Stringer, who had formed an exploratory committee, said he will focus on his reelection campaign instead of pursuing the Senate.

Stringer's announcement comes four days after Rep. Steve Israel (D-N.Y.) also announced that he won't run against Gillibrand.

Israel noted that President Barack ObamaBarack Obama21 state AGs denounce DeVos for ending student loan reform Obama to net 0K for Wall Street speech: report Trump’s wall jams GOP in shutdown talks MORE urged him to clear the Democratic primary for Gillibrand, something Stringer also noted in his statement.

"In light of President Obama's clear desire to avoid a Democratic primary in New York state, I have decided to focus on my re-election race for Manhattan Borough President and to suspend my exploratory committee and fund-raising efforts for the 2010 Senate race," Stringer said.

The Hill reported Tuesday that Obama and, in particular, Sen. Charles SchumerCharles SchumerSchumer: 'Good for country' if Trump punts on border wall fight GOP senator: There will never be full U.S.-Mexico border wall GOP fundraiser enters crowded primary for Pa. Senate seat MORE (D-N.Y.) have gone on the offensive to try to prevent a messy Democratic Senate primary next year.

Other New York Democratic representatives are looking at the race. Congresswoman Carolyn Maloney (D-N.Y.), in particular, is reportedly telling people that she will run.

Rep. Carolyn McCarthyCarolyn McCarthyWhy Congress needs an openly atheist member, now Lobbying World Lobbying world MORE (D-N.Y.) has also indicated she is considering at the race.

jeremy.jacobs@thehill.com