Today's chemical attack in Syria against innocent people, including women and children, is reprehensible and cannot be ignored by the civilized world. These heinous actions by the Bashar al-Assad regime are a consequence of the past administration's weakness and irresolution. President Obama said in 2012 that he would establish a "red line" against the use of chemical weapons and then did nothing. The United States stands with our allies across the globe to condemn this intolerable attack.
NOTE: The statement referred to President Bashar al-Asad of Syria.
Donald J. Trump, Statement on the Chemical Weapons Attack in Khan Sheikhoun, Syria Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/326539