Defamation cases amongst politicians and public figures are not that uncommon, lemme do a thread of those referred to by news media (as opposed to actual judgments):
“The article contained comments made by Mr Daryl Vaz in relation to Mr Abe Dabdoub in bringing election petitions. The Observer has been advised that the comments made by Mr Daryl Vaz were inaccurate.” Apology http://www.jamaicaobserver.com/news/apology_127645?profile=1373
“Seaga claimed that Harper was a supporter of the ruling People's National Party. Harper denied this and promptly sued the JLP leader for slander.” Privy council agreed with Harper
http://old.jamaica-gleaner.com/gleaner/20080131/lead/lead4.html
http://old.jamaica-gleaner.com/gleaner/20080131/lead/lead4.html
Mr. Bunting had sued Mr. Shaw for defamation following comments made during the political campaign season in 2011. http://radiojamaicanewsonline.com/local/shaw-moves-to-settle-outstanding-funds-to-bunting
In court documents obtained by The Gleaner, Bignall said the tweet suggested that he practises law in an unethical and improper manner and exaggerates his clients’ personal injury claims. http://jamaica-gleaner.com/article/lead-stories/20190130/defamation-suit-filed-against-emily-shields
The suit also claimed certain words which were spoken by Superintendent Clunis and Commissioner Ellington that were aired by both TVJ and CVM defamed Mr. Troupe and Mr. Reid. https://nationwideradiojm.com/st-james-councillors-awarded-millions-in-defamation-suit-against-tvj-cvm-state/
The Court said that the law of defamation did not prevent an aggrieved party from bringing an action because the award of damages would in all probability be derisory. http://jamaica-gleaner.com/power/12913
The Supreme Court has ordered journalist Cliff Hughes to pay former Prime Minister PJ Patterson $12.5 million in damages resulting from defamation to his character. http://www.jamaicaobserver.com/news/Cliff-Hughes-to-pay-PJ-Patterson--12-5m-for-defamation
Lawyers for Juliet Holness ... filed a defamation suit against Dr Peter Phillips for statements allegedly made by him and associates of the People’s National Party (PNP) between 13 -16 February, 2016. http://www.jamaicaobserver.com/news/Juliet-Holness-files-defamation-lawsuit-against-Peter-Phillips
Campbell has been given seven days to respond to government minister Daryl Vaz’s lawyers, who have demanded that he apologise for allegedly defaming him in a series of tweets and in a PNP WhatsApp group. http://jamaica-gleaner.com/article/lead-stories/20191110/legal-showdown-looms-vaz-moves-take-legal-action-against-pnp-official