Story highlights Press freedom is at its lowest point globally in 13 years

The report's measure of US press freedom also declined by 2 points

(CNN) Press freedom in the United States and across the world is at its lowest point in 13 years, according to a new report by the independent watchdog group Freedom House.

The group makes its annual analysis based on the legal, political, and economic environment for journalists in the prior year. The countries are rated on a scale of 0-100, and the closer to zero a country is, the freer its press.

This year's report changed the United States' press freedom rating by two points, from 21 to 23 -- its worst rating in more than a decade. The group attributes this to a worsening political environment, the rise and polarization of partisan media outlets and an increase in Russian-sponsored propaganda related to the 2016 presidential election.

President Donald Trump's open disparagement of the press, both as a candidate and since taking office, also contributed to the diminished score, according to the report.

"No US president in recent memory has shown greater contempt for the press than Trump in his first months in office," the report noted. "Trump's attacks mirror initial actions in other countries where media freedom subsequently suffered far more drastic restrictions and interference."

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