[2] His tenure is best known for his controversial 1996 decision to allow the cultivation of GMO soy in Argentina, authorized a mere 81 days after Monsanto applied for a permit.

As governor and amid 9% economic growth, his support for Kirchnerist candidates in his province during the campaign for the 2005 legislative elections helped result for a landslide win over Duhalde's faction and other parties.

He successfully headed Kirchner's Front for Victory party list for his province's congressional candidates in 2007, stepped down as governor and returned to Congress.

[7] Solá became a primary candidate in August 2009 for president ahead of the 2011 elections;[7] but lacking support, he withdrew on 11 June and endorsed Duhalde's Popular Union ticket, which went on to fifth place.

Amid a worsening economic crisis Solá stated that his goal was to promote unity against the Mauricio Macri administration for the 2019 elections.

[11] On 6 December 2019, it was announced Solá would be the next Minister of Foreign Affairs and Worship of Argentina in the incoming cabinet of President Alberto Fernández.