I would say he’s not Constitutionally qualified, but that kinda went out the window where Democrats are concerned...
It's not so cut and dried. There is room for mischief. From Wikipedia:
Under the Twenty-second Amendment, the President of the United States may not be elected to more than two terms. However, there is no similar such limitation as to how many times one can be elected Vice President. Scholars disagree whether a former President barred from election to the Presidency is also ineligible to be elected Vice President, as suggested by the Twelfth Amendment. The issue has never been tested in practice.