Under Article 1 Section 7 of the US Constitution, the President has the authority to veto any piece of legislation passed by Congress (and Congress can override the veto with a 2/3 majority in both Chambers). However, I am not to sure if this gives the President the power to veto repeals, but Clause 3 says that any resolution, motion, order, etc. that requires both the Senate and House to concur together needs the approval of the President, therefore any repeal of a law will also need the President's approval.
Is this the case?