Pledges by politicians are about as useful as the methane they blow out their a$$e$. The Nuclear Waste Policy Act of 1986 set the framework for management of "spent" fuel in this country. A Presidential candidate can pander to the anti-nuke kooks all they want about Yucca Mountain, but unless the NWPA legislation is repealed or amended, the President can't unilaterally change the policy. There would be a court challenge and the President would lose.
If we were really serious about a constructive and practical solution to waste management, we would lift the ban on fuel reprocessing in this country and also implement full actinide recycle with the recovered Pu as fuel for LWRs. Waste partitioning alone isn't going to cut it. Partitioning with actinide recycle will.