Senate Democrats will try to negotiate with moderate Sens. Joe Manchin and Kyrsten Sinema to address their disagreements on the size and scope of President Joe Biden's economic package as it heads to the chamber, Senate Majority Leader Chuck Schumer said Sunday.

"The House did a very strong bill. Everyone knows that Manchin and Sinema have their concerns, but we're going to try to negotiate with them and get a very strong, bold bill out of the Senate which will then go back to the House and pass," Schumer, a New York Democrat, said during a news briefing, stressing the importance of party unity.

The comments from the leader come days after House Democrats passed the Build Back Better bill, a key piece of Biden's sweeping domestic agenda. The $1.9 trillion plan, however, faces hurdles in the Senate, where Manchin of West Virginia and Sinema of Arizona have voiced concerns over its reach and price tag.

Schumer held the Sunday briefing to stress the importance of including a provision in the Build Back Better bill that would lower the cost of insulin. The bill passed by the House last week capped what Americans pay for insulin at $35 a month, something Sinema affirmed her support for earlier this month.