Lori Loughlin's attorney dropped a bombshell yesterday afternoon -- claiming the FBI told former college admissions advisor Rick Singer to LIE about Loughlin's knowledge of the money she supposedly thought she and hubby Mossimo Giannulli were donating to Singer's charitable foundation, in order to prove the actress knew the "donation" was actually a bribe!

Loughlin and Giannulli’s attorney Sean M. Berkowitz says Singer and the FBI organized “recorded phone calls that they [the FBI] directed him to make to his clients in order to induce inculpatory statements to be used against those clients.”

“Singer’s notes indicate that FBI agents yelled at him and instructed him to lie by saying that he told his clients who participated in the in the alleged ‘side door’ scheme that their payments were bribes, rather than legitimate donations that went to the schools,” Berkowitz states in the court documents.

Singer recalled in notes about his interactions with a particular FBI agent: "“Essentially, they are asking me to bend the truth… Liz raised her voice to me like she did in the hotel room about agreeing with her that everyone bribed the schools. This time about asking each person to agree to a lie I was telling them."

The couple's attorney was to appear in court today in Boston so that the judge could set a trial date, but this last-minute filing includes a motion for the court to delay the trial in light of the new information. The judge, however, denied the request but allowed for further filings through the beginning of April. Jury selection is set for Sept. 28 and the trial is to begin Oct. 5. The couple faces millions of dollars in fines and up to 50 years in prison.