This is another boldface lie from the resident genocidal Zionist psychopath.
If the US were to acknowledge Israel blocking aid then they would be violating Foreign Assistance Act, which says the US government must immediately suspend any military assistance to any country that blocks US humanitarian assistance.
I've only seen the white house repeatedly avoid acknowledging Israel's blocking of the aid, instead focusing on settlers/protestors and repeating the talking point that "aid is getting in, we'd just like to see Israel do more" or "there are no restrictions on the amount of aid that can enter Gaza."
On the same day as the vote, the White House declared, contrary to all evidence, that Israel has not blocked humanitarian aid from Gaza
www.theguardian.com
Miller once acknowledged one specific event where flour was blocked, but clarified that the US has not made an assessment that Israel is in violation of the Foreign Assistance Act.