Illustration: Lindsey Bailey/AxiosPresident Trump's historic strikes on Iran happened without Congress' approval, becoming the latest example of the president sidelining the GOP-controlled legislature in his second term.Why it matters: Since returning to office, Trump has bypassed Congress and asserted executive power in unprecedented ways that could have long-term consequences for the U.S. and international order.While Democrats have seethed, Republicans have largely defended Trump's broader de...