WASHINGTON — Lawyers for Paul Manafort, President Trump’s former campaign chairman, asked a federal judge in Northern Virginia on Friday to show leniency when he sentences Mr. Manafort next week, casting him as a loyal, compassionate, idealistic man who has learned a “harsh lesson.”

They said Mr. Manafort, who has been jailed since June, had already suffered greatly for his crimes. At age 69, plagued by health problems, he poses no risk of recidivism, they said.

Their sentencing memorandum, the second they filed this week, was submitted to Judge T.S. Ellis III of the United States District Court in Alexandria, Va. Judge Ellis will sentence Mr. Manafort on Thursday for tax fraud, bank fraud and other financial crimes. The next week, he will be sentenced by Judge Amy Berman Jackson in a related conspiracy case in United States District Court in Washington, D.C.

Advisory sentencing guidelines set Mr. Manafort’s punishment at 19 to 24 years in the financial fraud case. While they recommended no specific sentence, prosecutors working for the special counsel, Robert S. Mueller III, have said they agreed with that calculation by the federal probation office.