KAMPALA, Uganda — Ugandan police on Tuesday again arrested Bobi Wine, a popular singer and opposition presidential hopeful, just after he was successfully certified as a candidate in next year's election.

Wine, who is bidding to unseat Uganda’s long-time leader, was dragged from his car by police. The local NBS Television, reporting from the scene, said the singer, whose real name is Kyagulanyi Ssentamu, was put into a police van amid violent scuffles between police and his supporters.

A police spokesman did not immediately respond to questions. Authorities frequently accuse Wine of planning rallies that could disrupt public order, which he denies.

Critics say President Yoweri Museveni, in power since 1986, increasingly depends on the armed forces to assert his authority.

Museveni, who was nominated as a candidate on Monday, said afterward that his government would not tolerate the activities of enemies he did not name who are allegedly plotting chaos.

“There's nobody who is going to disturb here. Whoever tries will regret. Because for us, we don't play," the president said. “The (ruling party) fought to bring peace in this country. Nobody has more guns than us. But we don't scare people.”

The electoral commission has not fixed a date for the polls.

Wine, 38, has captured the imagination of many Ugandans with his persistent calls for the 76-year-old Museveni to retire. He is especially popular with poor people in urban areas.

“We now enter the most critical phase of our liberation struggle!” Wine tweeted after having his candidacy certified.

Wine and other opposition leaders have been frequently arrested in recent years, sometimes detained within their own homes by police citing a need to prevent crimes from being committed.

Those actions have reinforced a view among some Ugandans that the police serve at the behest of Museveni, who has rebuffed repeated calls to retire peacefully.

This East African country has never witnessed a peaceful transfer of power since independence from British colonial rule in 1962.

Rodney Muhumuza, The Associated Press