Peter Robinson and Martin McGuinness congratulated the Holywood golfer on his stunning run of form after the world number one won his last two tournaments - including his first Open Championship last month.McIlroy's win at Valhalla is the 25-year-old's second US PGA Championship, after he sealed victory at Kiawah Island in 2012 by a record eight strokes."Rory has played stunning golf to claim his fourth major title. He is a sporting sensation and joins an impressive list of champions to win back-to-back majors," the Ministers said."We are incredibly proud to watch as he writes his story of golfing greatness and we look forward to the next chapter as these victories propel him towards being the golfer of his generation."Enterprise Minister Arlene Foster added that McIlroy's victory in the US will further boost tourism in Northern Ireland."By winning the US PGA, his second major in just three weeks, Rory has taken another step towards greatness and has once again shown the world what is great about Northern Ireland golf," she commented."I'm sure everyone who stayed up into the wee small hours to watch the final stages of the championship was on the edge of their seat as Rory battled back from a three-shot deficit to win the fourth major of his career."Not only does this victory cement Rory's position as World Number One, it also underlines Northern Ireland's status as the home of major champions."The DUP politician added: "It should make us very proud that six of the last 19 major championships have been won by golfers from Northern Ireland."This will give golfers of all abilities even more reason to travel to Northern Ireland to find out for themselves what makes our golf courses the home of major champions."Sports Minister Carál Ní Chuilín said that McIlroy battled fellow competitors, and unseasonably bad weather, to top the leaderboard."Weeks from his last major triumph, and shortly after his return to the top of the world rankings, Rory is in dominant form. He is an extraordinary local sportsman who is playing his way into the history books."As he enjoys his latest tournament win, I wish him continued success in his quest for golf's career grand slam," the Sinn Féin minister added."Fittingly, Rory is the first golfer to win back-to-back majors since Pádraig Harrington in 2008. Yet, with this win, he has exceeded Pádraig's three major titles to become the most successful Irish golfer of all-time."President of Ireland Michael D Higgins said: "I wish to extend my best wishes and congratulations to Rory McIlroy on his remarkable win yesterday evening at the 96th US PGA Championships in Louisville, Kentucky. "To win a second major championship and to regain number one position in the world in the space of a few weeks is an outstanding achievement which has been warmly cheered on by young and old on our island. "Rory is capturing the imaginations of people, not just across the island of Ireland, but all around the world. I wish this talented and inspiring young sportsman continued fulfilment and success into the future."