(Adds background on Bezos)
WASHINGTON, Feb 8 (Reuters) - American Media Inc, the owner of the National Enquirer, said on Friday it acted lawfully in its reporting on Jeff Bezos, chief executive of Amazon.com Inc , and that it would thoroughly investigate his claims of blackmail and take whatever action was necessary.
Bezos on Thursday accused AMI of trying to blackmail him with the threat of publishing "intimate photos" he allegedly sent to his girlfriend unless he said in public that the supermarket tabloid's reporting on him was not politically motivated.
"American Media believes fervently that it acted lawfully in the reporting of the story of Mr. Bezos," the company said in a statement.
Bezos, the world's richest man, and his wife announced last month that they were divorcing after 25 years of marriage. That same day, the National Enquirer touted it was publishing alleged intimate text messages between Bezos and Lauren Sanchez, a former television anchor whom he was said to be dating.
Bezos, Amazon and the newspaper he owns privately, the Washington Post, have all been targets of attacks on Twitter by U.S. President Donald Trump.
Reporting by Chris Sanders; Writing by Mohammad Zargham; Editing by Tim Ahmann and Nick Zieminski