Reagan propped up Iraq and was directly responsible for that nation's development of chemical and biological weapons. During the same period, he was selling missiles and other armaments to Iran, an avowed enemy of the United States. At the same time, he was laying the foundation for what eventually became the Taliban regime in Afghanistan, as well as the al Qaeda terrorist network that operated from that country.
George W. Bush used those Iraqi weapons of mass destruction as a pretext for a war of choice against Iraq, a move that has aided and strengthened Shia fundamentalism in Iran while undermining global security. His war against Afghanistan, to destroy the very regime whose roots were laid down by Reagan, has recently been exposed as a farce; the Taliban has come roaring back to life, bringing battles and bombs back into the daily routine of that battered nation.
Creating chaos and destruction in the Middle East, thus delivering a more dangerous world, stands as the main legacy for these two Republicans in that region. Reagan and Bush pursued policies that have made this nation and the world vastly less secure, and supporters of both would have us ignore these hard truths in lieu of empty talking points. Republicans are strong on national defense, you see. Republicans keep us safe.
With friends like these, who needs friends?
If Republicans even have any friends, the friends probably don't even like 'em.