The leaders of Germany, Spain, Greece and Portugal are set to attend the conference, while French President Emmanuel Macron is sending a junior minister as he deals with the “yellow vest” protests at home.
Belgium’s liberal premier Charles Michel won the support of parliament to head to Morocco and back the accord, but his coalition risks losing the backing of a key Flemish nationalist party over the issue.
From the US to Europe and beyond, right-wing leaders have been taking increasingly draconian measures to shut out migrants in recent years.
Trump made curbing immigration and building a wall on the US-Mexico border a key election pledge and has focused his recent ire on a migrant caravan from Central America.
In Europe, anti-immigrant sentiment helped push a populist coalition to power in Italy that has clamped down on boats rescuing migrants at sea and Hungary’s premier Viktor Orban has pushed restrictive legislation.