WASHINGTON (Reuters) - U.S. Treasury Secretary Steven Mnuchin said on Sunday the repeal of the Obamacare individual healthcare mandate was not a bargaining chip in negotiations over the Senate tax legislation. “This is all about getting this passed in the Senate. This isn’t a bargaining chip, the president thinks we should get rid of it and I think we should get rid of it,” Mnuchin said on Fox News Sunday. “It’s an unfair tax on poor people.” 