The USA can’t do that with Hamas, as they are listed officially as a foreign terrorist organization. What you’re referring to is humanitarian aid that goes through agencies, like UNRWA for example.
And humanitarian aid is something that Israel lets through and into Gaza (Israel has a blockade around Gaza) and thus Israel has no problem with that.
Just a day or so ago, the Israeli Ambassador was speaking at the UN Human Rights Council and he said that Israel has no fight with the Palestinian civilians in Gaza, but only with Hamas.
Also, see Post #5 for what the USA does with money coming in to Hamas from other countries.
That might be what the USA does. On the other hand, there is what the Ø regime does.
Like the "diplomatic pouch", the Ø regime uses its power in lots of small ways to aid Hamas and hurt Israel. Based on what I've read and heard, UNRWA is a hotbed of terrorists, like the State dept is a hotbed of spies.
As was posted above the United States has been twisting Israel’s arm to force it to give aid and support to the Hamas terrorist organization. Perhaps the most egregious example is the requirement that Israel supply concrete to Hamas. I have no doubt that both the US and Israel knew that it was being used to build the tunnels, since they both could see what above-ground infrastructure projects were being completed.
Code Pink and Bernadine Dohrn among others have gone to Gaza and met with Hamas during the Obama regime.
Finally a consensus seems to be emerging in Israel that this may be an opportune time to obliterate Hamas, now that the Obama regime is weakened and Egypt and Saudi Arabia are giving their tacit approval.