Senator Cory Booker stood out among 10 contenders for the 2020 Democratic presidential nomination when he said at a debate on Wednesday night that he would not recommit the US to the 2015 nuclear agreement with Iran.

“If I have an opportunity to leverage a better deal, then I’m going to do it,” Booker said, adding that he would consider security conditions in the Middle East and would not “say unilaterally” that he would rejoin the accord as it stands now.

Booker said as president he would “do the best I can to secure this country.”

At the same time, he opined that it was a mistake for President Donald Trump to leave the agreement.

There are 25 candidates seeking the Democratic presidential nomination but only 10 participated in Wednesday night’s debate due to the large number of candidates. In addition to Booker, Senator Elizabeth Warren, former Texas Rep. Beto O’Rourke, New York City Mayor Bill de Blasio and former Housing and Urban Development Secretary Julian Castro were among those who took part in Wednesday’s debate.

Former Vice President Joe Biden will participate in the second part of the debate on Thursday night.