This is the 'You can't do that' defense, which has worked brilliantly at stopping him to date.
I am starting to get the idea that you and I have a fundamentally different assessment of how well the rule of law is holding up here at the moment.
This isn't a question of "stopping" Trump. There's nothing to stop: at 12pm on Wednesday January 2021, Donald Trump's first term in office expires. If the senate has not confirmed his re-election at that time, he vacates the office automatically. The senate doesn't call for him to relinquish the office, because there is no provision, no mechanism, by which he may remain in office. Nobody needs to
do anything, he doesn't need to turn in his badge and gun, he simply
ceases to be the president of the United States. "You can't do that" is not a prohibition, it's a bluntly empirical statement, "you do not possess the ability to perform that action".
For Trump to remain in office, he would need to explicitly appointed to the office by the Senate. The constitution does not provide this power to the Senate; while it does provide for the senate to appoint an acting president in the event of a tie, it specifies that the appointee must be a federal office. As Trump will not hold federal office upon vacating the presidency, he is not eligible for appointment. (Nor is Biden.) US law lays out a clear order of succession, starting with the Speaker of the House; even if they found a way to circumvent that law, they are still require to appoint a federal officer, they cannot just pick any civilian they take a liking too.
There is no viable scenario in which the Senate decides to ignore the clear instructions of the US constitution and appoint Trump to the presidency in the absence of a clear electoral victory. They do not have the power to do so, and no federal officer, no member of the military or any federal agency, no officer in any state or territorial government, would be require to respect it. Convincing a workable majority of the American government apparatus to go along with it would mean spending enormous amounts of money and political capital, enough to bankrupt them for a generation, and they aren't going to do that for a syphilitic moron that they didn't want to nominate in the first place.