President Donald Trump is swiftly breaching the traditional boundaries of presidential power as he returns to the White House, bringing to bear a lifetime of bending the limits in courthouses, boardrooms and politics to forge an expansive view of his authority.

He's already unleashed an unprecedented wave of executive orders, daring anyone to stop him, with actions intended to clamp down on border crossings, limit the constitutional guarantee of birthright citizenship and keep the popular Chinese-owned TikTok operational despite a law shutting down the social media platform.