Berlusconi said “it would be unjust and uncharitable” to deny Trump's “achievements” as US President.
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He remains a popular public figure in Italy despite being best known in Italy and abroad for sex scandals and a tax fraud conviction.
His political tactics are often seen as a trailblazing model for Trump's.
In November, Berlusconi commented that Trump's “very often too arrogant attitude” had been to blame for his election defeat.
The attack in Washington has also been condemned by Berlusconi's ally Matteo Salvini of the hard-right League party, long an outspoken backer of Trump.
“Violence is never a solution, never. Long live freedom and democracy, always and everywhere,” Salvini tweeted.
Italian Prime Minister Giuseppe Conte voiced concern about the attack on Wednesday, writing on Twitter that: “Violence is incompatible with the exercise of democratic rights and freedoms.”
I am following what is happening in #Washington with great concern. Violence is incompatible with the exercise of democratic rights and freedoms. I am confident in the strength and robustness of the institutions of the United States. #CapitolHill
— Giuseppe Conte (@GiuseppeConteIT) January 6, 2021
However, Conte and other members of the current Italian government did not join some other European political leaders including German Chancellor Angela Merkel in directly criticising Trump and his supporters over the Capitol attack.
“This tragic episode, the American right, which reflects a widespread mood in American society, encouraged by irresponsible propaganda, is certainly not the Republican right that we have always appreciated,” Berlusconi said.