Democrats & Republicans Wanted Trump’s Cognition Tested so Why Not Same for Sleepy Joe Biden Obviously Demented?

Few if any Republicans in Congress offered resistance to the public clamor from leftists and RINO’s for president Trump to take a cognition test, so why aren’t few if any Democrats contesting that Biden take a cognition test, maybe because few Republicans in Congress are campaigning for that which is a great curiosity to the American people seeing Biden in such bad shape?