Rep. Michael McCaul, the top Republican on the House Foreign Affairs Committee, voiced optimism on Sunday that a new aid package for Ukraine would pass soon in Congress.

“I think time is of the essence,” he told.

He believes the next two to three weeks are going to be critical.

He said, “I don’t think we have a lot of time to waste in Congress. I wish we’d had this a little bit sooner, but we have it now.”

House Speaker Nancy Pelosi led an official congressional delegation to Kyiv on Sunday.

They met with Ukrainian President Volodymyr Zelensky to discuss humanitarian and financial aid.

He explained, “Every day we don’t send [Ukraine] more weapons is a day where more people will be killed and a day where they could lose this war. I think they can win it. But we have to give them the tools to do it.”

When asked if he was concerned that Russian President Vladimir Putin may use nuclear weapons, McCaul said, “That’s always a concern.”

He believes Russia’s use of a chemical or tactical nuclear weapon would be “beyond the pale” and would “reach a red line.”

“If that happens, the US and its allies will have to respond “in kind,” he said.