If the Republicans really wanted to push liberals and Democrats completely over the edge and actually driving them insane all they would have to do is legislate that there would be three additional Justices needed on the Supreme Court changing it from Nine to Twelve. Then send it to Trump to nominate the additional new Justices.
The Constitution leaves it to Congress to determine how many Justices should be on the Supreme Court, originally there was Six Justices (1 Chief and 5 Associates). Congress decides the number of Justices and the President nominates the Justices so if Congress added, say, two or three new Justices then Trump would be the one to Nominate them. Since the Republicans control everything it's not beyond the possibility they could do just that.
Can you imagine the cries and shouts coming from the Democrats and Liberals?