Giuliani and other allies have suggested that GOP state legislatures in battleground states Biden won should try to use a delay in certification to appoint their own slate of electors and ignore the states' popular votes for Biden.

Trump extended the invitation on Thursday morning to the Michigan lawmakers by calling Mike Shirkey, the person familiar previously told CNN.

Shirkey has not responded to emails from CNN either, and his phone mailbox was also full.

Earlier this week, Trump called two Republican canvass board members from Wayne County to offer his support, after they went back and forth on voting to certify the election results from the state's largest county, which includes Detroit.

Biden currently has a 154,187 vote lead over Trump in the Great Lakes State.

On September 24, Shirkey led the Senate to pass a resolution assuring that electors will vote for the candidate with the most votes as certified by election officials.