An opposition lawmaker said Friday the response was inadequate because it did not go on to explain where the millions were spent.
Chhun Yasith, the head of the Cambodian Freedom Fighters, was sentenced to life in prison without parole in a US court on Tuesday.
The charge, for distribution of false information, carries a penalty of up to 15 years in prison.
The opposition party in recent months has been deeply critical of recent government efforts to mark the once-contested border.
Officials said the aid delivery was a routine part of bilateral ties between the two countries.
Chhun Yasith was a naturalized US citizen who fled Cambodia as a refugee in 1982.
If a warrant is issued for her arrest, she will be the second Sam Rainsy Party member to be abroad and facing a jail term.
Subedi said last week he was not confident the courts could bring justice to the people of Cambodia.
Om Yentieng, who is head of the Anti-Corruption Unit, said he had the statue erected “without prior permission and by my own decision."
Mu Sochua plans to stay through June 25, to submit her petition to the administration and to take part in the screening of the film.
The regulation, signed by Prime Minister Hun Sen May 31, calls on authorities to make lists of squatter communities.
His visit also comes as Cambodian officials are facing criticism from the opposition for its border demarcation policies.