Just to be accurate, the Ottawa Treaty (Convention on the Prohibition of the Use, Stockpiling, Production and Transfer of Anti-Personnel Mines and on their Destruction) as its more formal name indicates, only applies to anti-personnel mines. There is no treaty as such restricting the use of anti-tank or vehicle mines.
Further, the US was never a signatory to the Ottawa Treaty but voluntarily decided to restrict production of and the use of anti-personnel mines outside Korea since Sept 23rd, 2014.
I'm not sure what is driving the need to rescind this commitment unless it's another example of undoing everything the Obama administration has done. While Mattis had a study conducted in 2017 concluded that prohibiting anti-personnel mine use outside of Korea “increased risk to mission success” and could increase U.S. casualties most nations are convinced that the proliferation of anti-personnel mines harms far more innocent people than it adds to the value of a defensive position. While there is a risk, the proportionality argument far outweighs the military risk one.
:cheers: