Obama due to begin state visit to Philippines
During his visit, Mr Obama will hold talks with President Benigno Aquino and attend a state dinner.
A new defence agreement between the US and the Philippines is due to be signed shortly before Mr Obama's arrival.
However, the presence of foreign troops is a sensitive issue in the Philippines, a former US colony.
The Enhanced Defence Co-operation Agreement will give US forces temporary access to some military camps and allow them to station fighter jets and ships.
The 10-year pact allows a larger US military presence in the Philippines as Manila grapples with increasingly tense territorial disputes with China.
Protests expected
Banners welcoming the US leader have been placed along roads leading to the Malacanang presidential palace, but correspondents say not everyone will be welcoming Mr Obama.
Anti-US activists are expected to march near the presidential palace while Mr Obama is meeting Mr Aquino.
They say that the defence agreement will not benefit the Philippines and is detrimental to its sovereignty.
The US president has already visited Japan, South Korea and Malaysia.
In Kuala Lumpur on Sunday, Mr Obama said the US and Malaysia were at the start of a "new era of partnership".
He said he and Prime Minister Najib Razak had spoken about human rights, and he defended his decision not to meet Malaysia's jailed opposition leader Anwar Ibrahim.
The US had condemned Mr Anwar's sodomy conviction as politically motivated.
Banners welcoming the US leader have been placed along roads leading to the Malacanang presidential palace, but correspondents say not everyone will be welcoming Mr Obama.
Anti-US activists are expected to march near the presidential palace while Mr Obama is meeting Mr Aquino.
They say that the defence agreement will not benefit the Philippines and is detrimental to its sovereignty.
The US president has already visited Japan, South Korea and Malaysia.
In Kuala Lumpur on Sunday, Mr Obama said the US and Malaysia were at the start of a "new era of partnership".
He said he and Prime Minister Najib Razak had spoken about human rights, and he defended his decision not to meet Malaysia's jailed opposition leader Anwar Ibrahim.
The US had condemned Mr Anwar's sodomy conviction as politically motivated.
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