Jared Kushner, U.S. President Donald Trump's son-in-law and senior adviser, finally has a permanent security clearance.
The permanent security clearance for Kushner had been pending since past year.
Kushner's access was downgraded in February when White House Chief of Staff John Kelly ordered that officials with interim clearances be cut off if they hadn't received permanent clearances.
Staff secretary Rob Porter later resigned.
Lowell said Kushner past year became "one of the first to voluntarily cooperate with any investigation into the 2016 campaign and related topics", the daily reported.
When Trump took office a year ago, Kushner was granted interim clearance which allowed him to handle classified information while his background check was ongoing.
Lowell continued to sidestep the question of whether Kushner was a target, subject, or witness, saying, "Nobody has indicated they have any intention of saying to him, you've done something wrong that would merit any charges".
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"In each occasion, he answered all questions asked and did whatever he could to expedite the conclusion of all the investigations", Lowell said. The first set of questions in November centered largely on former national security adviser Michael Flynn, according to the person familiar with the matter.
The person who spoke about Kushner's security clearance insisted on anonymity to discuss the process.
Kushner is leading a Trump effort to resurrect the Israeli-Palestinian peace process and has been a Trump conduit to Mexico, among other activities. But Kushner's troubles were compounded at least in part because his initial security clearance application didn't list dozens of foreign contacts that he later included in updated submissions to the Federal Bureau of Investigation. The interview did not deal with Kushner's finances or his companies, Lowell said.
He said Kushner's clearance was decided by career officials in the intelligence community and the Federal Bureau of Investigation.
White House officials have blamed the delay in Kushner receiving his security clearance on administrative backlogs normal to a new administration, as well as the complicated nature of his application.
Some had expected Kushner might not receive a permanent clearance for the duration of Mueller's investigation. Then, in June, Kushner filed a third addendum acknowledging a meeting he had in June 2016 at Trump Tower with a Russian lawyer offering damaging information on Hillary Clinton.