Spicer refers Russia investigation questions to Trump's outside attorney

Trump retained the services of lawyer Marc Kasowitz last week.

"Our job, we are focused on the president's agenda, and going forward all questions on these matters will be referred to outside counsel Marc Kasowitz," said Spicer at an off-camera briefing with reporters.

Comey could testify as early as next week, when the Senate returns to Washington. The Senate Intelligence Committee has yet to announce any potential hearing.

Despite Spicer's instruction, the White House has not provided a point of contact to reporters for Kasowitz. Kasowitz's law firm, Kasowitz Benson Torres, LLP appeared to be unaware of Spicer's comments when reached by ABC News by phone.

The attorney has represented Trump "on a range of litigation matters for over 15 years," according to his firm's website.

ABC News' Pierre Thomas, Devin Dwyer, Katherine Faulders and Alexander Mallin contributed to this report.