DT could have been the one who authorized Jared's top secret clearance. It's possible.

According to this article from Nov 2016, the President could have done so at any time, on his own volition.

Maybe this is all P.R. The more I think about it, the more possible it seems that DT simply made the decision, and is using it to lift the cloud that's hanging over Kushner. He probably thinks he should have done it long ago.

-- Just found a Democrat who, like me, doubts that this was entirely the work of some unknown career staffer -- Rep. Lieu.

https://www.nytimes.com/2016/11/17/us/politics/jared-kushner-trump-family.html

WASHINGTON — After days of reports that President-elect Donald J. Trump had requested a top-secret security clearance for his son-in-law, Jared Kushner, people close to Mr. Kushner said that was not the case. No such request has been made, they said on Wednesday, and he will not sit in on the president’s highly classified daily intelligence briefing.

But should Mr. Trump change his mind, former government officials and experts on classified information said he would have wide latitude as president to bring a family member into the most secret circles of the government.

“The president can authorize clearance for anyone he wants,” said Steven Aftergood, director of the project on government secrecy at the Federation of American Scientists. “It’s part of his commander-in-chief role. He has broad, essentially unlimited, access in this area.”

Like anyone else, Mr. Kushner would be subject to a background check by the F.B.I. But the president’s authority is so broad, Mr. Aftergood said, that he could override red flags — like fraud, huge personal debt or ties to foreign governments — that would disqualify other applicants.

http://thehill.com/homenews/administration/389113-democrat-claims-kushner-wouldnt-have-a-security-clearance-if-he-wasnt

Rep. Ted Lieu (D-Calif.) said on Wednesday that if White House senior adviser Jared Kushner wasn’t President Trump’s son-in-law, he would not have been granted a permanent security clearance.

Lieu claimed on Twitter that the FBI does not grant security clearance and the decision to give Kushner one on Wednesday was made by the White House.

“Kushner omitted his Trump Tower meeting not once, but TWICE on his SF-86s,” Lieu write on twitter. “If he wasn't the son-in-law of @POTUS, he would not have a clearance.”