The Taoiseach has said that while he supports investment in regional airports, Dublin Airport is the main gateway to Ireland and he supports a lifting of the passenger cap.
But Leo Varadkar said that issues around noise pollution and environmental concerns also have to be considered.
Dublin Airport is seeking to expand its capacity beyond the current limit of 32 million passengers per annum to 40 million.
However a number of Green Party politicians have expressed concern, including Minister for Children, Equality, Disability, Integration and Youth, Roderic O'Gorman.
This afternoon, Mr O'Gorman said that he had made a submission outlining local concerns around noise pollution.
He also said he wanted to see regional airport growth.
Fianna Fáil junior transport minister, Jack Chambers, said that he fully supports the lifting of a passenger cap at Dublin Airport, arguing that the country cannot have a policy of "de-growth".
Earlier the Ryanair CEO, Michael O'Leary, called for the Transport Minister, Eamon Ryan, to resign.
He said Mr Ryan's position is untenable when he allows a number of his own party's TDs and MEPs to seek to block growth at Dublin Airport.
"As an island on the periphery of Europe, Ireland and Irish tourism need growth in low-cost air access, particularly when this growth is being delivered on new and more efficient aircraft, which carry more passengers but burn less fuel and reduce noise emissions as well," said Mr O'Leary.
However, responding to the Ryanair boss' call, the Taoiseach said that the Government is a better one because the Green Party is in it.
- additional reporting Will Goodbody
