White House officials said on Tuesday that 14 American citizens were killed and 20 or more were missing after the brazen attack on Israel, which President Joe Biden condemned as an act of “pure unadulterated evil.” Jake Sullivan, Biden’s national security adviser, told reporters Tuesday that it remains unclear how many of the missing were in the hands of Hamas, the Palestinian group that controls Gaza and carried out the attacks that began Saturday morning and have killed more than 1,000 people