Did you use one of the recalled DIY wiring books? You need help, as you have wired a dead short.

Your wiring for the switch is causing a dead short-
The white from the switch should be remarked as a black and the two wire (black and re-marked white) from the switch should be breaking the black power leg on the lights.
As you have it set up now, you are direct shorting the black to the white when the switch is flipped "on".

The black (hot) wire always goes to the switch first. You need a three wire between the 2 pot lights if your power is coming from the lights.

Ground goes to everything.

Black and white from source to first pot. White to light and black to black of 3 wire. Red of three wire to black of light.

3 wire goes to second pot. Black to white of 2 wire that goes to switch, remark this white with a black marker. White of 3 wire to white of light. Red of 3 wire and black of 2 wire from switch to black of light.

2 wire from 2nd pot to switch with black and white remarked as black, fasten to the two terminals.