The Trump administration has massed naval and air forces near Iran and is signaling possible military strikes after a recent high-risk operation in Venezuela.
Iranian government braces for possible attack as US navy arrives in region
US carrier strike group deployment places guided-missile assets within striking range of Iran, raising prospects of a US-Israeli attack aimed at toppling Iran's clerical leadership amid protests and economic turmoil.
Trump urges Iran protesters to "take over" government institutions
Trump weighs strikes on Iran while urging protesters to keep protesting; White House skepticism and internet blackout complicate assessment amid reports of thousands killed.