U.S. President Donald J. Trump has reportedly voiced concerns to senior aides about the possibility of launching military action to remove Venezuelan President Nicolás Maduro. The potential operations — which could include airstrikes on military and government sites as well as covert ground missions — have raised fears that such actions might fail to force Maduro from power and could instead spark a full-scale war between the United States and Venezuela, according to officials familiar with the discussions who spoke to The Wall Street Journal.