Jeremy Corbyn, 68, said he was “very concerned” about how soon the US president was invited by Prime Minister Theresa May - just a week after he took office in January.
In an interview with the Independent, Mr Corbyn said: “Obviously there have to be relations with the USA.
“My views on Donald Trump’s statements and utterances during the Presidential election are extremely well known.
GettyLabour leader Jeremy Corbyn has hinted he could postpone Donald Trump's state visit
"There has to be a relationship with the US Government, you have to tell them what you believe.”
Mr Trump was initially due to cross the Atlantic in June but the visit was postponed until early October.
Mr Corbyn also pointed out that the former US President Barack Obama had to wait three years into his administration for his first state visit.
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The politicians taking part in the debate
My views on Donald Trump’s statements and utterances during the Presidential election are extremely well known
Labour leader Jeremy Corbyn
When Mr Obama did visit in 2011 he met David