U.S. Secretary of State Rex Tillerson's expected exit from the Trump administration is one of many staff changes likely as President Donald Trump nears the end of his first year in office, with sources saying top economic adviser Gary Cohn and son-in-law Jared Kushner could be among those who depart.

Cohn, whose relationship with Trump became tense earlier this year, has considered leaving once the Republican effort to overhaul the U.S. tax system is completed in Congress, according to the sources with ties to the White House who spoke on condition of anonymity.

Kushner, who has seen his influence in the White House shrink, may receive a "face-saving" exit as he deals with legal challenges related to a special counsel's investigation of Trump's 2016 presidential campaign's potential ties to Russia, one of the sources said.