Mr. Kushner has also been interviewed by Robert S. Mueller III, the special counsel, though it is not known whether any potential actions relevant to the Russia inquiry are part of the delay in finishing Mr. Kushner’s background check.
Abbe D. Lowell, Mr. Kushner’s lawyer, said in a statement that “it is not uncommon for this process to take this long in a new administration (some taking as long as two years)” and that there are “a dozen or more people at Mr. Kushner’s level whose process is delayed like his.”
Questions about the security clearance process at the White House have become more urgent after the scandal surrounding Mr. Porter and the still-unanswered questions about when the president’s aides knew about the abuse allegations against him. On Monday, Sarah Huckabee Sanders, the White House press secretary, again refused to provide a detailed explanation.
“I can’t get into the specifics,” Ms. Sanders said in response to questions about what…