“Man, you should throw in the towel for the good of the country,” Wałęsa said in an interview with Radio Zet.
“Why don't you love Poland?” he added.
The former president of Poland likewise lambasted the current government of the Law and Justice party, of which Duda was a member before he took office.
“We should call for a referendum and remove this government from power in a democratic way,” Wałęsa said.
He reserved his strongest criticisms for Jarosław Kaczyński, chairman of the Law and Justice party, and his late twin brother, former president of Poland Lech Kaczyński.
“All of Poland's miseries stem from the Kaczyńskis,” he claimed.
“It is Jarosław Kaczyński who is the cause of all this evil,” he argued.
Wałesa's comments follow an EU parliament resolution last week that stated that the rule of law, democracy and human rights are endangered in Poland.
Wałęsa and the Kaczyńskis were brothers-in-arms during the Solidarity era, but they later fell out during his presidency of Poland (1990-1995) following the collapse of communism. He dismissed them from his presidential team in 1992.
1970s informant allegations
In Wednesday's interview with Radio Zet, Wałęsa also reiterated claims that recently revealed documents allegedly showing he collaborated with Poland's communist era secret police are forgeries.
He viewed the documents last week at the Institute of National Remembrance (IPN), and duly stated that only one of them is genuine.
“These IPN documents are fakes,” he claimed in today's interview.
“You can see that from a kilometre away.”
Wałesa allegedly collaborated with the security services in the 1970s, but broke off ties several years prior to the creation of the Solidarity trade union.
He has admitted to having had talks with the security services (SB) but has claimed he was the master of the situation.
“If you're looking for cooperation, then in this conception the SB cooperated with me and not the other way round,” he wrote on his blog in early March. (nh)