WASHINGTON (AP) — President Donald Trump will mark the end of his first 100 days in office with a flurry of executive orders, looking to fulfill campaign promises and rack up victories ahead of that milestone by turning to a presidential tool he once derided. [...] Trump's frequent use of the executive order points to his struggles getting legislation though a Congress controlled by his own party and few of the orders themselves appear to deliver the sweeping changes the president has promised. In Trump's case, he's struggled even though both houses of Congress are in the hands of Republicans; his health care bill never even came for a vote in the House of Representatives after it drew sharp criticism from moderate and conservative Republicans alike. Among them: his late March order that directed federal agencies to rescind any existing regulations that "unduly burden the development of domestic energy resources," a move that rolls back environmental protections that was denounced by Democrats and environmentalists and cheered by Republicans who advocate energy independence. [...] during his campaign, Trump talked tough on trade, vowing to slap punitive tariffs on companies that move production offshore and on countries that undercut U.S.