Washington (CNN) House Democrats say a deal to advance President Donald Trump's revised North American Free Trade Agreement is likely to be announced on Tuesday, after months of secretive negotiations between lawmakers and the White House over the pact.

"I think that there's going to be an announcement tomorrow," Oregon Democratic Rep. Earl Blumenauer told reporters Monday evening after a meeting with key lawmakers and House Speaker Nancy Pelosi to discuss the agreement. "I'm very optimistic based on what I've been a part of and what I've seen and what I hear."

US Trade Representative Robert Lighthizer is traveling to Mexico City alongside Jared Kushner for an event with Mexican and Canadian officials on Tuesday. A source familiar with the talks told CNN that Lighthizer plans to sign an updated version of the trade agreement. Politico was first to report that signing the deal is the purpose of Lighthizer's trip to the Mexican capital.

House Ways and Means Committee Chairman Richard Neal said Monday that he is "delighted" with the deal, even as lawmakers await final legislative text. Asked if it would be fair to say a handshake agreement exists between Democrats and the White House, Neal responded, "I think it's fair to say we're doing great."

"By any objective standard this is substantially improved. We've constructed, I believe, a template for the future," Neal said, also telling reporters he would like to see the deal on paper this week.

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