President Trump advised Iran to " quickly make a deal" on its nuclear program because a new U.S. attack on the country "will be far worse" than the last one. Why it matters: Trump has ordered a U.S. military buildup in the Gulf ahead of a possible strike. Iran, Israel and other countries in the region have been on high alert for days expecting a U.S. strike. - But White House officials say Trump still hasn't made a final decision and is still willing to explore a diplomatic solution. - "We are open to business if Iran wants to talk," a White House official told reporters on Monday. Driving the news: Trump told Axios on Monday that the U.S. "armada" off the coast of Iran was bigger than the one he sent to Venezuela . - In a Truth…