US President George Bush is in Pakistan on the final stage of his first tour of South Asia.
His talks with President Pervez Musharraf will focus on the war on terror and ways of combating "radical Islam" he says.
The BBC's Aamer Ahmed Khan in Islamabad says Mr Bush's visit comes at a turbulent time for Mr Musharraf.
Demonstrations over cartoons of the Prophet Muhammad have turned into protests against the president.
In India, Mr Bush reached a landmark nuclear cooperation agreement with Prime Minister Manmohan Singh.
US officials have ruled out any similar deal with Pakistan.
High security
Mr Bush's aircraft touched down at the Chaklala airbase in Rawalpindi, close to the capital, Islamabad on Friday night.
Security was tight with anti-aircraft guns set up on the hills near the base, reports say.
Mr Bush and his wife Laura then travelled on to the US embassy in Islamabad.
"I will meet with President Musharraf to discuss Pakistan's vital cooperation in the war on terror and our efforts to foster economic and political development so that we can reduce the appeal of radical Islam," Mr Bush said before leaving India on Friday.
"I believe that a prosperous, democratic Pakistan will be a steadfast partner for America," he said.
Several conservative Islamic parties and student organisations have rallied supporters across the country for anti-US marches, with many demonstrators also condemning Western countries for printing cartoons which satirised the Prophet Muhammad.
Police used batons to disperse a crowd of hundreds of protesters in Rawalpindi.
Some of the demonstrators had chanted slogans such as "killer go back" and "death to America" during the protest.
Some 300 students in Islamabad also held a protest, burning an effigy of the US leader.
"We are protesting against the coming of Bush because we hate him. He is the killer of so many innocent people, so many innocent Muslims," protester Javed Rahman told the Associated Press news agency.
Mr Bush and President Musharraf are due to hold talks on Saturday morning, Pakistan's foreign office said.
Mr Bush will also be briefed on relief efforts after last October's massive South Asian earthquake.
'Strengthen economy'
While in India, Mr Bush described India and America as "global leaders", in an address outlining his vision of a new strategic partnership at a speech in the capital Delhi.
It followed the completion on Thursday of a controversial deal on nuclear co-operation between the two countries.
"Our agreement will strengthen the security and the economy of both our nations," the US president said.
The co-operation agreement, which is still to be ratified by the US Congress, gives India access to US technology, although it has not signed the Nuclear Non-proliferation Treaty.
It reverses US policy, which had put restrictions on nuclear co-operation ever since India became a nuclear power in 1974.
(BBC)
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