"The US side has cited scheduling reasons", he added.
The White House announced in August that Mr Trump would travel to Ireland as part of a trip to attend the 100th anniversary of the armistice that ended World War One in Paris on 11 November.
However, White House press secretary Sarah Huckabee Sanders told reporters that Mr. Trump's schedule for his trip to Europe was not yet settled.
He told Irish radio station RTE on September 2: "There is an open invitation to the US President to visit Ireland at any time".
"The President will go to Paris in November, as previously announced, and we still agree on whether Ireland stop on this trip".
The US President was originally invited to Ireland by former taoiseach Enda Kenny on his final St Patrick's Day visit to the White House past year. "As primary facets are confirmed we can let".
A tricked-out iPhone XS Max costs more than a MacBook
While you can't see it per se, Apple upgraded the phones' durability over their predecessors with an IP68 water resistance rating. But this time around each new model takes inspiration from the iPhone X, which means edge-to-edge screens and no home button.
During his stay in Ireland, Donald Trump was expected to visit his golf course in Doonbeg, County Clare on the west coast, as well as Dublin.
Trump's visit had been announced late last month, and reportedly took the Irish government by surprise.
Irish activists had pledged to hold protests.
The Irish Labour Party had also expressed displeasure about a proposed visit by Mr. Trump. "We hadn't known until just a couple of days ago that he was going to take the opportunity", he said.
The meeting would apparently be on the sidelines of the World War I Armistice Day ceremonies on November 11.
Fianna Fáil leader Micheál Martin said the expected cancellation of Mr Trump's visit reflected a relationship between the two countries that was "not functioning".