More buses carrying illegal immigrants arrived in Washington, D.C., and New York City Thursday morning, including one that dropped off migrants close to Vice President Kamala Harris’ residence, Fox News reported.

For months now, Republican governors in border states like Texas and Arizona have chartered buses to carry migrants north and east into sanctuary cities and other parts of the country, where they await processing of their asylum claims. The migrants go voluntarily, often to meet and stay with family members or friends already in the country.

But critics have accused the governors of using migrants as “political pawns” or even of “kidnapping” them. GOP officials say that President Joe Biden’s administration is not doing enough to secure the border and that sending migrant buses to Democrat-run cities is a form of protest to show the reality facing border towns every day.