Under fire from conservatives, the legislation was pulled from the floor in February.
Harriet Tubman was previously picked in an online poll to replace Andrew Jackson on the $20 bill.
The Republican presidential hopeful said Jerusalem should have a U.S. embassy before Havana.
The Republican leader added that a constitutional amendment likely wouldn't pass Congress.
The Florida Republican is the latest lawmaker to voice their concern over the talks.
Rep. Phil Roe wants to ensure that workers at the Department of Veterans' Affairs who violate civil law aren't eligible for bonuses.
He said Obama needs to “re-examine the point of the talks in the first place.”
Alexander Bolton 06/30/15 02:15 PM EDT
Sources close to McConnell say there's virtually no chance he will go along with the idea.
Sanders supports a constitutional amendment to undo the 2010 Citizens United decision.
The senators said, "what we saw in South Carolina is about hate, and it is about evil."