The Israeli prime minister highlighted Israel's supply of arms as being crucial to its success in defeating Hamas and preventing war with Hezbollah.
Cotton's letter was sparked by Prime Minister Benjamin Netanyahu's accusation that the Biden administration deliberately prevented the shipment of weapons to Israel.
The Defense Ministry said that Netanyahu's speech attacking the US regarding disputes over the pace of weapons transfers took the entire defense establishment by surprise.
The knowledge that the US is resupplying Israel may convince those in Lebanon with Hezbollah ties that reaching diplomatic solution is preferable to escalating hostilities.
Blinken said that Washington was still reviewing one shipment of large bombs for Israel over concerns that they could be used in densely populated areas.
US moves closer to F-15 sale to Israel • US military shoots down Houthi aerial weapons • IDF eliminates half of Hamas terrorists in Rafah
The discovery of this latest factory could be the last such revelation or at least one of the few remaining such facilities which Hamas still had in operation until now.