Wales Office Minister Alun Cairns will representing the British Government at the inauguration of Argentina's new President, Mauricio Macri.
The UK Government is hoping the new leader's election will mark an improvement in what have been strained relations between the two countries.
Mr Cairns will be the first minister British minister to attend an inauguration since 1999.
Ahead of his visit he said:
Opposition parties are demanding that the Transport Minister confirms that the Great Western main line will still be electrified through to Swansea by 2018. Patrick McLoughlin told MPs that the project was a top priority and is going ahead when other electrification schemes are being "paused". But he told Plaid Cymru's Jonathan Edwards that he'd have to write to him about the completion date.
Mr Edwards said he was "concerned by the ambiguity" of the minister's response. The Liberal Democrats' spokesperson in the Assembly says she'll also be writing to Patrick McLoughlin.
But the Wales Office Minister Alun Cairns has backed today's announcement.
Downing Street has confirmed that Vale of Glamorgan MP Alun Cairns is the new junior minister at the Wales Office. He takes over the role from the new Secretary of State, Stephen Crabb.
As was the case when Mr Crabb held the post, Mr Cairns will also be a government whip and do the Wales Office job part time. Both men are Conservative MPs, with the Liberal Democrat peer Baroness Randerson completing the Wales Office ministerial team.
Welsh Conservative MP Alun Cairns described Wales' PISA results as 'nothing short of a scandal' and said that 'parents across Wales are genuinely worried about their children's education.'
Education Secretary Michael Gove said that Wales was like a 'control sample' in an experiment, saying that Wales is