A Planned Parenthood building is seen in Birmingham, Alabama, March 14, 2022. Billionaire philanthropist MacKenzie Scott donated $275 million to women's healthcare provider Planned Parenthood, the largest gift from a single donor in the organization's mor
A Planned Parenthood building is seen in Birmingham, Alabama, March 14, 2022. Billionaire philanthropist MacKenzie Scott donated $275 million to women's healthcare provider Planned Parenthood, the largest gift from a single donor in the organization's more than 100-year history, Planned Parenthood said on March 23, 2022. Reuters / EVELYN HOCKSTEIN

Three U.S. abortion rights advocacy groups will spend $150 million on the 2022 midterm elections, focusing on battleground states as they step up efforts to safeguard abortion access across the country, they said on Monday.

Planned Parenthood Action Fund, NARAL Pro-Choice America and Emily's List said their joint investment was meant "to aggressively respond to the unprecedented attacks on sexual and reproductive rights and abortion rights across the country and raise voters' awareness of the lawmakers who are to blame."

The U.S. Supreme Court is due to decide by the end of June on a case involving a Republican-backed Mississippi abortion law, which has the potential to alter or reverse the landmark 1973 Roe v. Wade ruling that legalized abortion nationwide.

During oral arguments in the case, conservative justices signaled a willingness to dramatically curtail U.S. abortion rights.

In anticipation of the ruling, Republican-led state legislatures have been passing increasingly strict abortion bans, with five states enacting laws in 2022 that outlaw abortion earlier in pregnancy than allowed by Roe vs. Wade.

The three groups said the money will be spent mostly in swing states and states that could be integral to their efforts to maintain abortion access across the country, including Georgia, Michigan, Pennsylvania and California.

Money will go, among other activities, toward advertising, voter outreach and in-person actions at state capitals and in Washington, D.C. The organizations will support candidates at state and national level.

"We have reached a crisis moment for abortion access because conservative politicians have engaged in a coordinated effort to control our bodies and our futures," Alexis McGill Johnson, president of Planned Parenthood, said in a statement.

A 2021 survey of "ambivalent registered voters" in mostly swing states, commissioned by Planned Parenthood, Emily's List and American Bridge 21st Century, found the issue of abortion rights motivated voters to support Democrats over Republicans by a wide margin.

Reuters/Ipsos poll from December showed 48% of U.S. adults believe abortion should be legal for most or all cases, 38% say it should be illegal in all or most cases, and 14% are unsure.