If the money has been authorize, ABS, yes, a President can withhold funds. Nixon did so during his administration.
Did he do it with an EO? If so, link please.
Run along if you are not posting evidence yourself. Yes, he withheld the funds.
Fine. I looked it up, and yeah, Nixon did have that authority, but because he abused it, it was taken away. Nixon was the LAST president to have that power.
Impoundment is an act by a
President of the United States of not spending money that has been
appropriated by the
U.S. Congress.
Thomas Jefferson was the first president to exercise the power of impoundment in 1801. The power was available to all presidents up to and including
Richard Nixon, and was regarded as a power inherent to the office.
The Congressional Budget and Impoundment Control Act of 1974 was passed in response to perceived abuse of the power under President Nixon. Title X of the act, and its interpretation under Train v. City of New York, essentially removed the power. The president's ability to indefinitely reject congressionally approved spending was thus removed.
[1]
The Impoundment Control Act of 1974 provides that the president may propose rescission of specific funds, but that rescission must be approved by both the
House of Representatives and
Senate within 45 days. In effect, the requirement removed the impoundment power, since Congress is not required to vote on the rescission and, in fact, has ignored the vast majority of presidential requests.
[2]
Forty-three states in the U.S. give their governors authority not to spend money allocated by the
state legislature. The states which deny their governor the authority are
Indiana,
Nevada,
New Hampshire,
North Carolina,
Rhode Island, and
Vermont.
[3] The
Mayor of Washington, D.C. also has the impoundment power.
[4]
Impoundment of appropriated funds - Wikipedia
So, while you are technically correct that Nixon was able to do it, he was also the last president to have that power.
Trump doesn't have that authority because of the act that was passed in 1974. Trump has no authority to withhold funds from state and local governments without Congressional approval for more than 45 days, so no, he can't cut funding with an EO.