Senator Chuck Schumer (D-NY) is expected to announce tomorrow that he opposes the nuclear accord President Obama negotiated with the Ayatollah’s regime in Iran. Schumer, as the third-ranking Democrat in the Senate, wields heavy influence over his caucus, whose representatives have been split over the deal thus far.

The New York Democratic Senator was often brought up in a recent New York City rally where over 12,000 people came to protest the Iran deal.

Schumer said in a statement regarding the Iran deal:

Advocates on both sides have strong cases for their point of view that cannot simply be dismissed. This has made evaluating the agreement a difficult and deliberate endeavor, and after deep study, careful thought and considerable soul-searching, I have decided I must oppose the agreement and will vote yes on a motion of disapproval.

“There are some who believe that I can force my colleagues to vote my way. While I will certainly share my view and try to persuade them that the vote to disapprove is the right one, in my experience with matters of conscience and great consequence like this, each member ultimately comes to their own conclusion,” he added.

The New York Times reports that Schumer retreated to his Brooklyn apartment on the Sunday that the deal was announced and had continuously studied the accord until making his decision this week. He ultimately determined that the deal was not one he could support.

Opponents of the Iran deal have said that the agreement allows for Iran to secure $150 billion dollars in unfrozen assets, which it could use to empower the terrorist regimes it supports as the world’s leading state-sponsor of jihadist terror groups. The deal also gives Iran at least 24-days notice before international inspectors are allowed to investigate whether the regime is cheating the deal, and if the Mullahs have decided to make a push towards developing nuclear weapons.