<strong>FIRST ON FOX: </strong>Former President Donald Trump has made a major endorsement in what is expected to be one of this year's most closely watched Senate races.

Trump announced Sunday in a post on Truth Social that he would be backing former U.S. Army Captain Sam Brown to take on incumbent Democrat Sen. Jacky Rosen in November.

<i>This is a developing story. Check back here for updates.</i>

<div class="author-bio"><p>Brandon Gillespie is an associate editor at Fox News. Follow him on X at @BGillespieAL.</p></div>

Former President Donald Trump has endorsed Sam Brown in Nevada's Republican Senate primary over his former Iceland ambassador, Jeff Gunter.{ai:summary}<p>Former President Trump endorses Sam Brown in key Senate race against Sen. Rosen. Expect a heated battle. #politics</p>

Trump announces major endorsement in crucial battleground Senate race

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