Chuck Schumer said Sunday he is "disappointed" with the Iranian nuclear deal reached over the weekend, describing it as disproportionate and overly generous to the Iranian regime.

"I am disappointed by the terms of the agreement between Iran and the P5+1 nations because it does not seem proportional," read an official Schumer statement.

"Iran simply freezes its nuclear capabilities while we reduce the sanctions," Schumer continued. "This disproportionality of this agreement makes it more likely that Democrats and Republicans will join together and pass additional sanctions when we return in December. I intend to discuss that possibility with my colleagues."

While Republicans have been negative in their response to the announced deal, Schumer is not the only Democratic to express concern. Maryland's Ben Cardin has vowed that the agreement reached would not be the final terms of negotiation, implying the ultimate deal will be significantly tougher on Iran. "We will not stand by and let this be the final deal," Cardin said.