Maduro showed up at the last minute at a one-day meeting of the 33-member Community of Latin American and Caribbean States, or CELAC.
With 15,000 migrant children or teenagers in United States federal custody, the problem has become impossible to ignore.
Democrat Joe Biden has won the White House, US media said Saturday, defeating Donald Trump and ending a presidency that convulsed American politics, shocked the world and left the United States more divided than at any time in decades.
Critics say the law is will further a climate of repression that has existed in Nicaragua since the 2018 anti-government protests.
Nicaragua will hold presidential and legislative elections in 2021. The ruling Sandinista Front (FSLN) of President Ortega will seek his third successive re-election since 2007.
US stock futures tumbled Friday after Donald Trump said he and his wife had tested positive for the coronavirus.
Pompeo questioned what he defined as intensified attack against political opponents and independent media in Nicaragua
Alvarado spoke about the importance of Costa Rica's diplomatic relations with both China and the United States.