The supreme court left in place a Kentucky law requiring doctors to perform ultrasounds and show fetal images to patients before abortions on Monday.
The justices refused to review an appeals court ruling that upheld the law, and did not comment further. The move is seen as a victory for the anti-abortion movement in the US.
The development comes amid a wave of anti-abortion laws being passed by state legislatures across the US, focusing in conservative states. The laws are aimed at making access to abortion increasingly difficult and eventually forcing a supreme court showdown on the landmark Roe v Wade decision that legalized abortion in the US.