Trump wrote on his social media platform Truth criticizing the truce deal between Israel and Hamas and the prisoner exchange part between the two sides.
"Has anyone noticed that Hamas has repatriated people from other countries, but it has not yet returned even a single American hostage?"
Trump has not forgotten to criticize his opponent, the current US president, Joe Biden.
"There is only one reason for this (not releasing the Americans), because there is no respect for our state or our leadership. This is a very sad and dark period in America."
Biden has previously said he hopes detainees with U.S. citizenship in Hamas will be released in the near future, but said he did not know exactly when.