President Obama vowed in his State of the Union address Tuesday to veto any Iran sanctions bill Congress sends his way.

“The sanctions that we put in place helped make this opportunity possible,” the president told lawmakers. “But let me be clear: if this Congress sends me a new sanctions bill now that threatens to derail these talks, I will veto it. For the sake of our national security, we must give diplomacy a chance to succeed.”

The direct warning comes as 59 senators have endorsed bipartisan legislation threatening to slap new sanctions on Iran. Democrats and Republicans in both chambers have criticized the president's interim nuclear deal that went into effect last week for allowing Iran to continue low-level uranium enrichment and are weighing legislation demanding that any final deal forbid it.

Obama on Tuesday heralded the interim deal as a victory for diplomacy and a promising first step toward a potentially peaceful outcome to the nuclear standoff that is dominating his second term's foreign policy agenda.

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