Of­fi­cials in some of the 12 coun­tries whose cit­i­zens will be soon banned from vis­it­ing the Unit­ed States de­nounced Pres­i­dent Don­ald Trump’s move to res­ur­rect a hall­mark pol­i­cy of his first term and vowed Thurs­day to push back against the U.S.

The ban, which was an­nounced Wednes­day, takes ef­fect at 12:01 a.m. Mon­day, a cush­ion that may avoid the chaos that un­fold­ed at air­ports na­tion­wide when a sim­i­lar mea­sure took ef­fect with vir­tu­al­ly no no­tice in 2017. Trump, who sig­naled plans for a new ban up­on tak­ing of­fice again in Jan­u­ary, ap­pears to be on firmer ground this time af­ter the Supreme Court sided with him.

The 12 coun­tries — Afghanistan, Myan­mar, Chad, the Re­pub­lic of Con­go, Equa­to­r­i­al Guinea, Er­itrea, Haiti, Iran, Libya, So­ma­lia, Su­dan and Yemen — in­clude some of the world’s poor­est na­tions. Sev­en more coun­tries — Bu­run­di, Cu­ba, Laos, Sier­ra Leone, To­go, Turk­menistan and Venezuela — now face height­ened trav­el re­stric­tions.