Upon his release, Cahill again was put in charge of arms importation and to this end went to the United States. He was deported from the United States in 1984 for illegal entry (see Provisional IRA arms importation). He served on the IRA Army Council as late as the 1990s. In the late 1970s and early 1980s, he argued against proposals for Sinn Féin to stand in elections. However, in 1985, he spoke at the party's Ard Fheis in favour of republicans contesting elections and taking seats in the Dublin parliament, the Dáil.