The House committees investigating Trump scheduled Blair's deposition on Monday.
"Mr Blair is caught between allegations of legal obligation by two comparable branches of government, a conflict that he cannot resolve," Blair's lawyer Whit Whitman told CNN on Saturday.
"In the light of the clear direction given to him by the executive, Mr Blair respectfully declined to appear and give evidence. However, it will fulfill all its legal obligations once the conflict is properly resolved. "
Blair has not yet received a summons, but Ellerman said that Blair would still refuse to give evidence if summoned.
justice) upon which it is based,
Blair, who was previously associate director of national security programs at the Office of Management and Budget, followed Mulwani to the West Wing in January as his national security adviser after Mulwani became acting
Prior to joining the Trump administration, Blair served as director of staff on the House subcommittee on defense appropriations.