Apparently the Trump campaign believes (without proof) there were many "illegal votes" and saying the court should not allow certification until it could be verified that all votes were cast lawfully. It could be interesting as to how a court defines the verification process and who does the verifying, but the huge problem for the campaign team is that courts can't create laws.
But if the court could block Michigan from certifying election results, it could block any state including all the Red states for exactly the same reason. Without certification, the states electors can't vote on when the Electoral College meets by law on January 6, 2021. The Constitution's 12th Amendment clearly defines the process if and when none of the candidates get a 270 or more Electoral College majority. So if a court blocked the certification of the Texas election results or other large populated states, neither candidate could get an Electoral majority and per 12th Amendment, the House of Representatives decides the winner.
Currently, Biden has 146,000 move votes than Trump so the Trump campaign is saying and must prove at least 147,000 of the Biden votes are illegal, but none of the Trump votes are illegal. But that won't stop Trump's legal eagles from trying. Can't wait to hear the court ruling on this one.