Former Prime Minister Atal Bihari Vajpayee was admitted to the All India Institute of Medical Sciences in Delhi on Monday. The Bharatiya Janata Party, however, said it was for a routine check-up, the Hindustan Times reported.

The hospital said Vajpayee was in stable condition. Dr Randeep Guleria, a pulmonologist who is currently the director of AIIMS, will supervise Vajpayee. Guleria was the former prime minister’s personal physician for more than 30 years, The Times of India reported.

Later in the day, AIIMS issued a statement that Vajpayee was being treated for a urinary tract infection. The hospital said his treatment was being monitored, ANI reported.

Prime Minister Narendra Modi, BJP chief Amit Shah, Union minister JP Nadda, and Congress President Rahul Gandhi visited Vajpayee at the hospital in the evening.

The BJP leader, now 93, was the prime minister between 1998 and 2004 when the National Democratic Alliance government was in power. The government conferred the Bharat Ratna, India’s highest civilian honour, on him in 2015.