The FBI is poised to open its own investigation into Meghan Markle’s estranged dad after a vile stash of child pornography was allegedly uncovered at his home in the Philippines, according to a report.

Thomas Markle Sr., 82, was reported to local police by his own son, Thomas Markle Jr., who discovered “hundreds, if not thousands,” of disturbing child sex abuse images in storage boxes at his Cebu home, The Sun first reported.

The son contacted FBI investigators in the US, who plan to investigate Markle Sr., who is currently living in the States, and have requested contact information for investigators in the Philippines, the outlet reported.

In July, Markle Jr., 60, said he reported the sickening find to the FBI hotline, the US National Center for Exploited and Missing Children, and state police in Pennsylvania, where his father was living.

“An FBI agent has already requested the contact details of investigators leading the case in the Philippines,” a source close to the case in Cebu told the publication.

“There is a strong precedent for cases in circumstances like this to be investigated by the FBI,” the source said.

The FBI has not responded to The Post’s request for comment on the reported probe.

This is a developing story. Please check back for updates.