U.S. President Donald Trump on Wednesday signed a proclamation that bans individuals from 12 countries from entering the United States, reinstating one of the most controversial and defining measures from his first term in the wake of an attack in Boulder, Colorado, that targeted a march in support of Israeli hostages.

The second-term travel ban covers Afghanistan, Myanmar, Chad, Republic of the Congo, Equatorial Guinea, Eritrea, Haiti, Iran, Libya, Somalia, Sudan and Yemen. The measure also partially limits entry of people from Burundi, Cuba, Laos, Sierra Leone, Togo, Turkmenistan and Venezuela.

Trump earlier in the week blamed the immigration policies of former U.S. President Joe Biden for the presence of the suspect in the Boulder attack, who was an Egyptian who overstayed his visa and wouldn’t have been impacted by the ban. Witnesses say they saw the suspect use a makeshift flamethrower and throw an incendiary device in the attack.