"And that both parties, the Conservatives and Labour, will again already what they did for months - run down the clock".
He told the European Parliament: "The proof of this was that the first thing that after last week's decision was to go on holidays".
Mr Farage predicted his party would "sweep the board" in the elections.
British Green MEP Molly Scott Cato called on Britons to "share a message of hope of the positive change that the European Parliament" ahead of the upcoming EU elections.
And he hinted that Brexit could be delayed further - or even reversed - as he said British MEPs may be members of the Parliament for more than several months.
"They will be full Members of the Parliament, with all their rights and obligations".
"No, it can not. Therefore, I also ask you to reject similar ideas, if they were to be voiced in this House". "I fear most of all that it will import the Brexit mess into the EU".
Other EU leaders in the room remembered that fact and reminded Tusk that it is not their decision to make.
Mr Tusk had himself faced criticism from senior MEPs in the European Parliament for his part in allowing the United Kingdom a longer Brexit extension, now until October 31st, with one MEP warning that the decision would "poison" European elections, now due to begin on May 23rd.
The Labour leader said the party had put its case that the future relationship with Europe had to mean a customs union, but added Mrs May was under pressure from Tories who wanted "to turn this country into a deregulated low-tax society" to do a trade deal with US President Donald Trump. I didn't respond at the time, but today, in front of you, I would like to say: "at this rather hard moment in our history, we need dreamers and dreams", he added.
"We can not give into fatalism", Tusk said in a report to the European Parliament.
The intervention came as EU Council president Donald Tusk said he still believed Britain may not leave the EU.