WASHINGTON, Oct 14 (Reuters) - U.S. Senator Kyrsten Sinema, a key moderate, told fellow Democrats in the House of Representatives this week that she will not vote for a multitrillion-dollar package that is a top priority for President Joe Biden before Congress approves a $1 trillion infrastructure bill, according to a source briefed on the meeting.

Aides for Sinema, who has the power to stop legislation from advancing in the 50-50 Senate, did not immediately respond to a request for comment. (Reporting by Jarrett Renshaw, additional reporting by Richard Cowan; Editing by Scott Malone and Jonathan Oatis)