First of all, Clinton did not pay Paula Jones to keep quiet. It was a lawsuit settlement.
Second, Trump is accused of falsifying business records with the intent to violate federal campaign finance limits, unlawfully influence the 2016 U.S. presidential election, and commit tax fraud. 34 counts in total.
Big difference, but of course, you don't see that.
We have to keep the jury in a former president's criminal trial secret so the defendant doesn't order his supporters to literally murder them. This former president, who is also a proudly self admitted serial sexual assaulter and was found liable for rape, is also currently out on bail for other crimes and is under criminal indictment in four jurisdictions for nearly a hundred felonies.
He is also a current candidate for president of the United States.
From Heather Cox Richardson, historian:
It is a courtesy for the two sides at a trial to share with each other the names of their next witnesses so the other team can prepare for them. Today the prosecution declined to provide the names of their first three witnesses to the defense lawyers out of concern that Trump would broadcast them on social media. “Mr. Trump has been tweeting about the witnesses. We’re not telling them who the witnesses are,” prosecutor Joshua Steinglass said.
Merchan said he “can’t blame them.” Trump’s defense attorney Todd Blanche offered to "commit to the court and the [prosecution] that President Trump will not [post] about any witness" on social media. "I don't think you can make that representation," Merchan said, in a recognition that Trump cannot be trusted, even by his own lawyers.