(CNN) — Civil rights leader Rev. Jesse Jackson remains hospitalized and is now receiving a form of life support to stabilize his blood pressure, a source close to Jackson’s family told CNN on Sunday.

Jackson, 84, a protégé of the Rev. Martin Luther King Jr., has been under observation for progressive supranuclear palsy (PSP), the Rainbow PUSH Coalition said Wednesday evening.

Further details about his condition have not been released.

The family source says Jackson has had moments of brief energy due to a medication he has been on it for two days. Jackson had a significant drop in blood pressure Saturday night, but a medical team responded to him immediately, the source added.

Even while under treatment, he has shown brief, but meaningful signs of responsiveness, the source said.

“He

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