Merrick Garland was nominated to fill the Supreme Court vacancy created by the death of Antonin Scalia. After President Obama nominated him, the Republican Senate refused to schedule a hearing on the matter for almost a year. They said they would not consider anyone appointed by Obama. They said they would wait for the next President to be elected to office before taking any action.
The Republicans blocked Obama's Supreme Court nomination contrary to the United States Constitution. They refused to fulfill their responsibilities as United States Senators.
Now we have a new President and he has nominated Neil Gorsuch to fill the vacancy. The Senate must now act to either confirm or deny that nomination. It is their Constitutional duty.
The Democrats are threatening to do the same thing the Republicans did. They shouldn't. They should hold the confirmation hearings. During the hearings all of the Democratic Senators should each ask Gorsuch one particular question in addition to whatever other questions they deem fit. Here's the question:
"Were the Republican Senators following the Constitution and fulfilling their responsibilities as United Sates Senators when they refused to take any action whatsoever in regard to President Obama's nomination of Merrick Garland?"
If Gorsuch says yes, that alone should justify a vote for disqualifying him. If Gorsuch says no, then they should pursue that line of questioning and make him explain it all in great detail.
Call your Senators and urge them to ask this question during the confirmation hearings. Urge them to hold the confirmation hearings as well.