President Trump said the US will “turn away” the thousands of Central American migrants heading to the US border in search of asylum and blamed Democrats for being weak on immigration.

“Full efforts are being made to stop the onslaught of illegal aliens from crossing our Souther (sic) Border. People have to apply for asylum in Mexico first, and if they fail to do that, the U.S. will turn them away,” Trump wrote on his Twitter account on Sunday. “The courts are asking the U.S. to do things that are not doable!”

He continued to heap blame on the Democrats for the migrants marching north.

“The Caravans are a disgrace to the Democrat Party. Change the immigration laws NOW!,” he said.

Trump comments on the social messaging site come as the crowd of migrants fleeing poverty and violence in Honduras and El Salvador resumed their march to the US after being delayed by Mexico riot police on Saturday at the Guatemalan border.

The number of migrants swelled to about 5,000 as more people continue to join the group that stretches for about a mile.

Earlier Sunday, Homeland Security Secretary Kirstjen Nielsen said her department would monitor the caravan as it made its way to the border.

“While we closely monitor the caravan crisis, we must remain mindful of the transnational criminal organizations and other criminals that prey on the vulnerabilities of those undertaking the irregular migration journey,” Nielsen said in a statement. “We fully support the efforts of Guatemala, Honduras and Mexico, as they seek to address this critical situation and ensure a safer and more secure region.” ­

Last week, Trump said he could mobilize the US military and shut down the border if the migrant group didn’t turn around.