President Donald Trump on Monday said he believed his former personal lawyer, Michael Cohen, should serve a "full and complete sentence" for crimes to which he's pleaded guilty.

Trump said he has no connection to Cohen's crimes.

Last week, Cohen pleaded guilty to lying to Congress about his involvement in a plan to build a Trump Tower in Moscow.

President Donald Trump on Monday said he believed his former personal lawyer, Michael Cohen, should serve a "full and complete sentence" for crimes to which he's pleaded guilty.

Trump also said he has no connection to his ex-attorney's crimes, despite statements from Cohen to the contrary.

"'Michael Cohen asks judge for no Prison Time.' You mean he can do all of the TERRIBLE, unrelated to Trump, things having to do with fraud, big loans, Taxis, etc., and not serve a long prison term? He makes up stories to get a GREAT & ALREADY reduced deal for himself, and get his wife and father-in-law (who has the money?) off Scott Free. He lied for this outcome and should, in my opinion, serve a full and complete sentence," Trump tweeted on Monday.

Read more: Michael Cohen's lawyers dropped a slew of intriguing bombshells about Trump in a new court filing

Last week, Cohen pleaded guilty to lying to Congress about his involvement in a plan to build a Trump Tower in Moscow, saying his dishonesty was motivated by his loyalty to the president and a desire to be consistent with his messaging. This came after a new plea deal with the special counsel Robert Mueller, who's leading an investigation into Russian election interference and the Trump campaign's alleged collusion.

Cohen's legal team asked a federal judge to consider sparing him prison time in relation to his guilty pleas.

Cohen in August pleaded guilty to campaign-finance violations, tax evasion, and bank fraud, implicating Trump in relation to payments made to women with whom the president has been accused of having affairs.

Trump has vehemently denied colluding with Russia and often refers to Mueller's investigation as a "witch hunt."

The president on Monday continued his attacks on Mueller via Twitter.

Trump tweeted, "Bob Mueller (who is a much different man than people think) and his out of control band of Angry Democrats, don’t want the truth, they only want lies. The truth is very bad for their mission!"

Mueller is a former FBI director and a highly decorated US Marine Corps veteran who served in Vietnam.

As Trump attacked Cohen and Mueller, he also celebrated his former campaign adviser, Roger Stone, for saying he would "never" testify against the president. Referencing Stone in a tweet, the president said it was "nice to know that some people still have 'guts!'"

Stone is also a central figure in Mueller's investigation, particularly in relation to his links to WikiLeaks and its founder, Julian Assange.