May 21 (Reuters) - The leaders of three big U.S. oil

companies will host a fundraising luncheon in Houston on

Wednesday benefiting Donald Trump's presidential campaign,

according to a copy of an invitation seen by Reuters.

Drillers tend to back Trump's pro-fossil fuel and

anti-regulation agenda and have been critical of President Joe

Biden's efforts to phase out oil and gas in favor of renewables.

The luncheon, which will be held at Houston's Post Oak

Hotel, is hosted by Harold Hamm, founder of Continental

Resources; Kelcy Warren, executive chairman of Energy Transfer

Partners; and Vicki Hollub, CEO of Occidental Petroleum ( OXY ),

according to the invitation.

Trump is scheduled to speak.

Asked about the luncheon, Hollub told Reuters she is

speaking with policymakers from both parties to express

Occidental's support for federal subsidies for carbon capture

technologies that can keep greenhouse gases from the atmosphere.

Carbon capture is expensive and has yet to be proven

commercially at scale. Some environmental groups oppose it,

arguing it risks extending the fossil fuel era. Biden expanded

carbon capture subsidies in his 2022 Inflation Reduction Act,

part of a suite of measures to fight climate change.

Occidental has invested in carbon capture projects that

siphon carbon out of smokestacks, and last year announced plans

to build the world's largest direct air capture facility to suck

carbon out of the open air.

Officials for Continental and Energy Transfer Partners did

not provide comment on the luncheon.

Hamm and Warren are longtime supporters of Trump, having

backed his previous presidential bids. Hamm served as an

informal adviser to Trump during his 2017-2020 term at the White

House.

Trump last month had met with other oil executives at his

luxury Mar-a-Lago hotel in Florida and asked the industry for $1

billion to support his current run for president, according to

media reports.