PRESIDENTIAL TFR NEAR PBI VIOLATED BY A PA22 TRAINING FLT WHILE 10 MI W OF LNA.

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MY STUDENT AND I DEPARTED LNA ARPT TO THE W FOR A 2 HR TRAINING FLT. BEFORE DEP WE MONITORED AND XMITTED ON (122.7 LNA CTAF). WE HAD TO WAIT FOR ONE ARR AND 2 DEPS BEFORE WE TOOK OFF. WE DEPARTED THE AREA TO THE W AT 1000-1100 FT AND MONITORED 122.7 UNTIL CLR OF THE ARPT AREA. AFTER APPROX 2 HRS WE WERE RETURNING TO LNA FROM THE W WHEN AN F15 FLEW ACROSS THE NOSE OF OUR ACFT; APPROX 1/4-1/2 MI DISTANCE. I HAD THOUGHT THAT IT WAS UNUSUAL FOR AN F15 TO BE IN THIS AREA. APPROX 1-2 MINS LATER ANOTHER F15 FLEW ACROSS OUR NOSE; ONLY THIS TIME MUCH CLOSER; LESS THAN 1/4 MI. I REMEMBER TELLING MY STUDENT THAT SOMETHING MUST BE UP AND IMMEDIATELY CALLED PALM BEACH APCH AND RPTED BEING BUZZED BY THE F15'S. THEY TOLD ME THAT I WAS IN RESTR AIRSPACE AND TO DEVIATE TO THE S. I ASKED 'WHAT RESTR AIRSPACE?' AND WAS GIVEN PALM BEACH TWR PHONE NUMBER TO CALL WHEN I WAS ON THE GND. I WAS TOLD THAT THERE WAS A TFR IN PLACE (LATER I FOUND OUT IT WAS BECAUSE OF THE PRESIDENT). LATE AFTERNOON OR EARLY EVENING ON THE DAY BEFORE I HAD CALLED MIAMI FSS FOR THE NEXT DAY'S FLT CONDITION; AND TOLD THEM I WAS A FLT INSTRUCTOR. I WAS NOT BRIEFED OF THE FOLLOWING DAYS FLT RESTR. A BRIEF ANNOUNCEMENT OVER LCL FREQS IN THE AREA SOON TO BE AFFECTED BY A TFR WOULD BE A GOOD IDEA AND TO MAKE SURE BRIEFERS TELL PLTS OF IMPENDING TFR'S. I WILL SPECIFICALLY ASK FOR TFR'S FOR ALL LCL BRIEFINGS IN THE FUTURE.