Anyone who allows premises to be used for same-sex relations could face up to seven years in prison, and a person convicted of homosexuality could be sent for “rehabilitation.”

A team of lawyers and activists is drafting a lawsuit, whose details have not been divulged, challenging the law in Uganda’s Constitutional Court.

The legislation follows a yearslong campaign in Uganda to criminalize L.G.B.T.Q. people and those who support them. Politicians first drew up a similar measure in 2009, but when it was signed into law in 2014, the court struck it down on procedural grounds.

But over the past few years, political leaders, along with domestic and international religious organizations, began ramping up anti-gay campaigns and warning about what they call a threat to family values.

Politicians also began making baseless claims about a plot to promote gay activities and lure children in schools to homosexuality. Last year, the authorities shut down Sexual Minorities Uganda, a leading gay rights advocacy group, claiming it had not been officially registered with the government.