He then congratulated Attorney General Barr for successfully seizing control of the sentencing phase for his long-time political adviser.
"I don't want to talk about that now", Trump said.
The four lawyers who prosecuted Stone quit the case after the Justice Department overruled them and said it would lower the amount of prison time it would seek for Trump's ally.
The department instead suggested an unspecified term, though its filing said the original recommendation had been excessive.
The letter also cited Mr Barr's revelation that he has opened a channel in the department to collect information for investigations involving Ukraine, the country at the centre of the recent impeachment trial, which ended in Mr Trump's acquittal by the Senate.
US accuses Iran of building missiles through satellite bid
Iran suffered a Simorgh launch failure in January 2019 and another one with a different rocket, the Safir, a month later . The nation's defense ministry directs Tehran's space program.
As for any blowback against Justice or Barr, whose involvement came after Trump was critical of the proposed Stone sentence, Dershowitz emphasized that the president has constitutional authority to direct the Department of Justice to change its sentencing recommendations. But Trump's outrageous comments about the original sentence recommendation - and his history of interfering in the administration of justice - require that the decision be investigated.
Trump didn't answer directly when asked whether he is considering a pardon for Stone.
Stone was convicted in November of seven felonies for obstructing the inquiry by the House Intelligence Committee into Russian interference in the United States presidential election in 2016, lying to investigators under oath, and trying to block the testimony of a witness whose account would have exposed his lies.
On The Daily Show, Trevor Noah gave it a go, discussing the curious case of Stone, who received an early morning raid last January in connection with Robert Mueller's Special Counsel investigation. Ms Liu oversaw the prosecution of Mr Stone as well as two other former top Trump aides: 2016 campaign chair Paul Manafort and former White House national security advisor Michael Flynn. "Nine years recommended by four people that, perhaps they were Mueller people, I don't know who they were, prosecutors", the president said in the Oval Office.
Stone has denied wrongdoing and called the case politically motivated. The second memo, which appeared with court records on Tuesday afternoon, said a sentence "far less" than the prospective seven to nine years in prison "would be reasonable under the circumstances". Kamala Harris, D-Calif., former attorney general of California and a former federal prosecutor, sent a letter to Judiciary Committee Chairman Lindsey Graham, R-S.C., asking that he immediately schedule a hearing for Barr to testify "so that the committee and the American people can understand the Justice Department's decision to overrule its career prosecutors in this case".