New Jersey Gov. Phil Murphy (D) will undergo surgery Wednesday to remove a mass on his kidney.

In a statement to The Associated Press, Murphy's office indicated that Lt. Gov. Sheila Oliver (D) would take over "until further notice" while Murphy has the operation.

It isn't yet known whether the mass is cancerous, though most of its kind turn out to be malignant according to Murphy's office. The governor's office added that his doctors do not believe he will require chemotherapy or radiation treatments.

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Murphy first revealed the tumor's existence last month, and thanked well-wishers in his State of the State address, according to the AP.

“Friends – I’ve got a tumor on my left kidney and will undergo a partial nephrectomy in early March to remove it. The prognosis is very good and I’m profoundly grateful to my doctors for detecting the tumor early,” Murphy tweeted in February.

“Over 50,000 New Jerseyans will hear the words 'you have cancer' this year, so I'm far from alone here," he added.

Murphy added at the time of his diagnosis that the issue reminded him of the necessity of affordable health care.

“Health care is a right, not a privilege for a select few, and skyrocketing medical costs are a national emergency. If there’s anything my diagnosis reminds me of, it’s that preventative services are lifesaving and we need to continue fighting for affordable health care for all," he said in February.