added: "The Radical Left, with late term abortion (and worse), is imploding on this issue.

"We must stick together and Win for Life in 2020."

Alabama's governor on Wednesday signed a near-total prohibition on abortions widely seen as the country's most restrictive ban, and the Missouri legislature on Friday made the procedure illegal from eight weeks of pregnancy.

Neither make exceptions for rape or incest -- only for cases where the mother's life is in danger.

Republican-led legislatures in Georgia, Ohio, Mississippi, Kentucky, Iowa and North Dakota have also enacted laws banning abortion from the moment a fetal heartbeat is detected.

Supporters hope that legal battles over the laws will reach the Supreme Court, as they pursue the long-sought conservative goal of overturning its landmark 1973 abortion ruling, known as Roe v Wade.

Roev Wade guarantees women's rights to abortion as long as the fetus is not viable -- around 24 weeks of pregnancy.

Trump, a bombastic, twice-divorced billionaire, won over the evangelical vote during his 2016 campaign by promising to appoint anti-abortion justices at the Supreme Court.

He has since brought two conservative appointees to the highest court in the land -- Neil Gorsuch and Brett Kavanaugh -- shifting the balance of the nine-person bench.

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In a series of tweets on the deeply polarizing issue, Trump said the US had "come very far in the last two years" on abortion, and praised "two great new Supreme Court Justices".

On Sunday, defenders of women's reproductive rights are set to march in protest against Alabama's new abortion law in four of the Southern state's cities,