Another Democratic challenger to Sen. Kirsten GillibrandKirsten GillibrandDon’t let Congress amend the First Amendment Sanders plans to introduce single-payer bill in September Trump considering Giuliani law partner for US attorney in New York: report 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 ObamaCongress needs to assert the war power against a dangerous president CNN's Don Lemon: Anyone supporting Trump ‘complicit' in racism DOJ warrant of Trump resistance site triggers alarm 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. Chuck SchumerCharles SchumerDemocrats urge Trump to condemn Charlottesville violence Melania Trump on Charlottesville protests: 'No good comes from violence' It's time for McConnell to fight with Trump instead of against him 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.