Crowds of civilians rushed aid trucks in Gaza as hunger and desperation create chaotic scenes.
Hamas now finds itself in the most complex and difficult position it has faced since the war began.
The announcement is the latest turn in Trump's rollercoaster approach to tariffs since re-entering office in January.
Patients were evacuated from al-Awda hospital in Jabalia on Thursday evening.
Washington and Beijing agreed to temporarily lower tit-for-tat tariffs after talks in Geneva earlier this month.
The new order puts roughly 530,000 migrants from Cuba, Haiti, Nicaragua and Venezuela at risk of being deported.
Hamas said Thursday that its leadership had received a new Gaza ceasefire proposal and was studying it.
Nine alleged members of the notorious Gulf Cartel have been arrested on suspicion of murder.
Fletcher, the under-SG of humanitarian affairs, says "we're seeing food set on borders and not being allowed in".
