He worked closely with Sila M. Calderón, then Mayor of San Juan, being the city's Public Affairs and Federal Relations Advisor.
He subsequently was elected state chair of the Democratic Party in Puerto Rico, a position he currently holds, under DNC chairmen Howard Dean, with whom he also has a close relationship, Tim Kaine, the former governor of Virginia, Congresswoman Debbie Wasserman-Schultz and Donna Brazile.
In November 2010, he coauthored a book on the 2008 Hillary Clinton campaign in Puerto Rico with McClintock, then Secretary of State.
In September 2024, Prats wrote a letter asking the judge presiding over the bribery case involving US Senator Bob Menendez, asking for a lenient sentence for the lawmaker who accepted gold bars, cash and other bribes in exchange for favors using his influence and power on behalf of criminal associates and foreign governments.
https://newjerseymonitor.com/wp-content/uploads/2025/01/1-2-24-Menendez-sentencing-submission.pdf [1] • Te Quiero Puerto Rico - Primaria Presidencial Demócrata 2008,[2] Co-author with Kenneth McClintock, Aguilar, a subsidiary of Editorial Santillana, First edition in Spanish (200pp), 2010, ISBN 978-1-60484-744-4