By STEVEN NELSON

Rep. Alan Grayson, D-Fla., who is aggressively lobbying against a military strike on Syria, says the Obama administration has manipulated intelligence to push its case for U.S. involvement in the country’s two-year civil war.

Grayson made the accusation in an interview published Wednesday by The Atlantic and offered more detail in a Thursday discussion with U.S. News. He says members of Congress are being given intelligence briefings without any evidence to support administration claims that Syrian leader Bashar Assad ordered the use of chemical weapons.

Grayson said he cannot discuss the classified briefings, but noted details in the administration’s public, non-classified report are being contested.

[PHOTOS: Alleged Gas Attack Kills Hundreds Near Damascus]

The White House released its four-page public report Aug. 30, arguing that Assad’s government killed 1,429 people on Aug. 21 with a planned chemical weapon attack. Evidence cited in that report included “intercepted communications involving a senior official intimately familiar with the offensive who confirmed that chemical weapons were used.”

Grayson, however, says “the claim has been made that that information was completely mischaracterized.”

He points to an article published by The Daily Caller that alleges the communications actually showed Syrian officers were surprised by the alleged chemical weapon attack. The communications, according to unnamed sources paraphrased in article, were intercepted by Israeli intelligence and “doctored so that it leads a reader to just the opposite conclusion.”

[READ: U.S. Releases Syria Chemical Weapons Report]

“What they say in The Daily Caller is that [intercepted communications] would lead one to the opposite conclusion,” Grayson said. “I don’t know if it’s right or wrong, [but] there’s a very simple way to find out, that’s for the administration to show me and other members of Congress” translated transcripts of the intercepts, he said.

Members of Congress are “not being given any of the underlying elements of the intelligence reports,” according to Grayson. He’s not sure if the information will come before the votes on a proposed strike next week.